Recent from talks
Nothing was collected or created yet.
BTR-3
View on Wikipedia
The BTR-3[6][7] is an eight-wheel drive armored personnel carrier developed in 2000 and 2001 by an international consortium. The companies involved in the project include the Kharkiv Morozov Machine Building Design Bureau of Ukraine, Adcom Systems of Abu-Dhabi, UAE, and the State Scientific Technical Centre of Artillery & Rifle Arms of Ukraine. Although somewhat similar in appearance to the Soviet BTR-80, the BTR-3U is an all-new production vehicle rather than an update of the existing in-service vehicle.[8]
Key Information
Armament
[edit]The BTR-3U is fitted with the one-person KBA-105 "Shkval" unified fighting module which can accommodate 30mm gun, 7.62mm coaxial machine gun, 30mm automatic grenade launcher and anti-tank guided weapons. This module was developed by the State Scientific Technical Centre of Artillery & Rifle Arms of Ukraine. The Shkval fighting module design is versatile, but can also be used with another turret.[9]
- The Cockerill CSE 90LP with 90mm Cockerill LP
- The KBA-105 one person manned turret with 30 mm ZTM-1 dual-feed autocannon that has 350 rounds of ready-use ammunition or Stiletto turret with 30mm ZTM-2.
- A total of 2,500 rounds are carried for the 7.62mm coaxial machine gun.
- The 30 mm AGS-17D grenade launcher is mounted on the left side of the turret, having 29 rounds of ready-use ammunition, with additional 87 rounds being carried in reserve (three magazines, each containing 29 rounds).
- Cockerill CPWS 30 turret with 30mm autocannon.
- Six 81 mm electrically operated smoke/aerosol grenade launchers are mounted three either side of the turret rear and firing forwards.
- The sighting systems include a commander's 1PZ-3 observation periscope and a TKN-4S Agat stabilised sight which is integrated with the missile fire control system.
BTR-3DA has BM-3M Shturm-M weapon station armed with ZTM-1 30mm autocannon, KT-7,62 machine gun, KBA-117 30mm grenade launcher, six smoke grenade launchers 902B Tucha, and ATGM system, Barrier.[10]
Equipment design
[edit]The standard equipment of the BTR-3U also includes hydraulically amplified powered steering on the front four road wheels and a central tire-pressure regulation system that allows the driver to adjust the tire-pressure to suit the terrain being crossed. The BTR-3U is fitted with French Michelin tires.
The BTR-3U engine compartment consists of a Deutz BF6M1015 diesel developing 326 hp coupled to an Allison MD3066 fully automatic transmission. The power pack and transmission are fitted by the Kharkiv Morozov Machine Building Design Bureau with the technical assistance of the Deutz AG and the Allison Transmission companies. The engine compartment is fitted with an automatic double-action fire extinguishing system.
The vehicle is fully amphibious, propelled when afloat by a single water jet mounted at the rear of the hull. To prepare the vehicle for water, the driver erects a trim vane and switches on the bilge pumps from within the vehicle.
The troop compartment accommodates six soldiers who enter and leave the vehicle by a door in either side of the hull. The lower part of the door folds downward to form a step, with the upper part opening forwards. There are also hatches in the roof and firing ports with associated vision devices provided in the sides and front of the vehicle. An air conditioning system is fitted as standard to ensure crew comfort in hot conditions.
Variants
[edit]
- BTR-3U "Hunter": initially known as BTR-94K. As described.
- BTR-3U Guardian: version for UAE Marines with "Buran-N1" turret.
- BTR-3E: has a new UTD-20 engine.
- BTR-3E1: latest version with BM-3 "Shturm" turret and new engine MTU 6R106TD21[11]
- BTR-3E1D: Improved version of the E1.[12]
- BTR-3E1K: command vehicle.[12]
- BTR-3E ARV: recovery vehicle with winch, crane and dozer blade.
- BTR-3E 90: heavy fire support vehicle with 90mm Cockerill main gun.[13]
- BTR-3EU1: Special improved version developed for the Ukrainian military.[12]
- BTR-3DA: upgraded version purchased by the Ukrainian armed forces in 2017.[14][15] BTR-3DA is BM-3M Shturm-M weapon station armed with ZTM-1 30mm autocannon, KT-7,62 machine gun, KBA-117 30mm grenade launcher.[16]
- BTR-3KSH: version of command and control vehicle.
- BTR-3M1: 82mm mortar carrier.[12]
- BTR-3M2: 120mm mortar carrier.[12]
- BTR-3BR: armored recovery vehicle.[12]
- BTR-3RK: anti-tank missile carrier. [12]
- BTR-3S: armored ambulance.[12]
Operators
[edit]
Azerbaijan: six BTR-3/12.7s[17]
Chad: 12 BTR-3Es[18]
Ecuador: three BTR-3Us ordered[1]
Kazakhstan: two BTR-3Es [1]
Myanmar: 500+ BTR-3Us in service. 10+ BTR-3Us bought from Ukraine in 2001.[19][20] Kyiv signed a US$500 million contract in 2004 to supply 1000 BTR-3U armoured personnel carriers (APCs). Purchased as kits to be assembled locally until 2013. According to Building the Tatmadaw report, the Myanmar Army was operating more than 500 BTR-3Us as of 2008.[3] According to Amnesty International, the last batch with 368 BTR-3Us was delivered as of January 2013.[21][22][23][24]
Nigeria: 30 BTR-3UNs, six BTR-3UKs, four BTR-3UR and seven BTR-3E/14.5s[1]
Saudi Arabia: General Directorate of Civil Defense[25]
Russia: At least 12 were captured by Russian forces during the Russian invasion of Ukraine.[26]
Sudan: Known to operate the BTR-3, at least 4 were confirmed lost during the 2023 Sudan conflict by photographic evidence.[27]
BTR-3 of the National Guard of Ukraine "Azov" Regiment
Thailand: 96 BTR-3E1s delivered with the price tag of 4 billion baht, 120 more on order from Ukraine.[28] The first two out of 96 BTR-3E1s were delivered at U Tapao Airport on 17 September 2010.[29] The second batch of 121 BTR-3E1s with a price tag of 5 billion baht has been ordered by the Royal Thai Army and 14 BTR-3E1s have been ordered by the Royal Thai Navy to be used by the Royal Thai Marine Corps in August 2010 with the MTU Engine and Edison Gear. The Royal Thai Army plans to use the BTR-3E1 as the backbone for one regiment of create the Mobile Infantry regiment which require 288 BTR-3E1s even the first 96 BTR-3E1 would be enough to create only one mobile infantry battalion. The first 96 BTR-3E1s consisted of seven different variants including 64 armoured personnel carriers, four command vehicles, three armoured ambulances, nine 81 mm mortar carriers, four 120 mm mortar carriers, six BTR-3E1s for ATMS anti-tank rocket unit, and six armoured recovery vehicles. In addition to the first batch of 96 BTR-3E1s, the Ukrainian government has given five BTR-3E1s for free including four armoured personnel carriers and one armoured recovery vehicle, while making a contract for the maintenance of nine BTR-3E1.[30] The batch of 12 BTR-3E1s for the Royal Thai Marine Corps have reached Thung Prong Port in Sattahip on 24 June 2011 and the ceremony has been held on 29 July 2011. These vehicles are to replace the aging V-150 armoured cars, which will be kept in the Reconnaissance Battalion of the Royal Thai Marine Corps before being deployed in three southern provinces.[31] Another order for 15 BTR-3E1s and 6 BTR-3RKs was placed by the Royal Thai Army in August 2013.[32][needs update]
United Arab Emirates: 90 Guardians[1]
Ukraine: 22 BTR-3Es were ordered for the Armed Forces of Ukraine and the National Guard of Ukraine,[33] five BTR-3Es were delivered in June 2014,[34] and 50 BTR-3DAs in December 2017.[14][35]
See also
[edit]References
[edit]- ^ a b c d e "UN Register of Conventional Arms – UNODA". Retrieved 6 December 2020.
- ^ "Enhancing the Royal Thai Army". 6 November 2013. Retrieved 6 December 2020.
- ^ a b Maung, Aung Myoe (2009). Building the Tatmadaw: Myanmar Armed Forces Since 1948. Institute of Southeast Asian Studies. p. 107. ISBN 978-981-230-848-1.
- ^ "Ukrainian-Made Oplot-M Tanks and BTR-3E1s Spotted in Action in Thailand: Here's What We Know". UNITED24 Media. 26 July 2025. Retrieved 14 December 2025.
- ^ "Cambodian Army Captures Thai BTR-3E1 Ukrainian-Made APC". Militarnyi. Retrieved 14 December 2025.
- ^ "BTR-3E1 Armoured Personnel Carrier - Army Technology". www.army-technology.com. Retrieved 6 December 2020.
- ^ "BTR-3U - Armored personnel carrier". Archived from the original on 17 September 2008. Retrieved 6 December 2020.
- ^ "KMDB - BTR-3U Armoured Personnel Carrier". 6 June 2011. Archived from the original on 6 June 2011. Retrieved 6 December 2020.
- ^ "Armored Vehicles Upgrade And Update: Ukrainian Accent". old.defence-ua.com.
- ^ "Al-Wahash Armored Personnel Carrier with Shturm Combat Turret at IDEX 2019 – A Joint Project of Ukraine and UAE". www.defense-aerospace.com.
- ^ "Бронетранспортер БТР-3Е1 - КБТЗ". Archived from the original on 29 September 2015. Retrieved 28 September 2015.
- ^ a b c d e f g h i "ODIN - OE Data Integration Network". odin.tradoc.army.mil. Retrieved 13 July 2025.
- ^ "Archived copy" (PDF). Archived from the original (PDF) on 24 December 2013. Retrieved 22 December 2013.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ a b Cranny-Evans, Samuel (2 November 2017). "Ukraine to purchase more BTR-3DA IFVs". IHS Jane's 360. Archived from the original on 3 January 2018. Retrieved 3 January 2018.
- ^ "BTR-3DA 8X8 APC". Army Recognition. 31 December 2017. Archived from the original on 3 January 2018. Retrieved 3 January 2018.
- ^ "Ukrainian air assault brigade tested the BTR-3DA during exercises". www.armyrecognition.com.
- ^ "List of military techniques Azerbaijan acquired over the past 7 years". Archived from the original on 8 December 2008. Retrieved 23 July 2008.
- ^ International Institute for Strategic Studies (2021). The Military Balance. Taylor & Francis. p. 457. ISBN 9781032012278.
- ^ The Military Balance 2020. Routledge. 14 February 2020. p. 296. ISBN 978-0367466398.
- ^ Building the Tatmadaw: Myanmar Armed Forces Since 1948 By Maung Aung Myoe, p107-108
- ^ "Archived copy". Archived from the original on 29 September 2007. Retrieved 21 November 2007.
{{cite web}}: CS1 maint: archived copy as title (link) - ^ JOSEPH ALLCHIN. "Ukraine "ceases" arms sales to Burma(Myanmar)". Archived from the original on 13 November 2020. Retrieved 10 August 2020.
- ^ ArmyRecognition. "Myanmar to manufacture locally Ukrainian-made BTR-3U 8x8 armoured vehicle personnel carrier".
- ^ MilitaryFactory. "BTR-3 APC".
- ^ Mitzer, Stijn; Oliemans, Joost. "Mean, Green, And Unseen: Saudi Arabia's BTR-3s". Oryx Blog. Retrieved 27 June 2022.
- ^ "Attack On Europe: Documenting Ukrainian Equipment Losses During The 2022 Russian Invasion Of Ukraine". Oryx Blog. Retrieved 11 September 2023.
- ^ "Documenting Equipment Losses During The 2023 Sudan Crisis".
- ^ Украина выиграла тендер на поставку 200 танков «Оплот» в Таиланд Segodnya.ua]
- ^ ยูเครนส่งมอบ "รถหุ้มเกราะ" ล็อตแรกถึงไทยแล้ว Archived 29 September 2011 at the Wayback Machine www.pattayadailynews.com]
- ^ ทบ.ชงซื้อรถหุ้มเกราะยูเครนล็อตสองอีก121คัน Archived 10 March 2012 at the Wayback Machine www.suthichaiyoon.com]
- ^ ยานเกราะล้อยางจากยูเครนถึงไทยแล้ว พร้อมปฏิบัติภารกิจใน 3 จชต. Archived 21 June 2012 at the Wayback Machine www.manager.co.th]
- ^ Thailand; Third batch Ukrainian BTR ordered Archived 6 August 2013 at the Wayback Machine – Dmilt.com, 3 August 2013
- ^ "Yatseniuk: Cabinet of Ministers to allocate Hr 100 million to buy 22 BTR-3Es". Kyiv Post. 23 May 2014. Retrieved 29 June 2014.
- ^ Нацгвардия получила пять новых БТР-3Е Киевского бронетанкового завода - СМИ // "УНИАН" от 25 июня 2014
- ^ "Ukraine army takes delivery of 50 BTR-3DA 8x8 APC armoured". Army Recognition. 31 December 2017. Archived from the original on 3 January 2018. Retrieved 3 January 2018.
External links
[edit]- BTR-3U Armoured Personnel Carrier at KMDB
- UN register of conventional arms Archived 14 December 2008 at the Wayback Machine
- BTR-3E1 Armoured Personnel Carrier, Ukraine
BTR-3
View on GrokipediaThe BTR-3 is an 8×8 wheeled amphibious armored personnel carrier developed by Ukraine's Kharkiv Morozov Machine Building Design Bureau (KMDB) in collaboration with ADCOM Manufacturing of the United Arab Emirates, with design work initiated in 2000 as a private venture to create a modern successor to Soviet-era BTR vehicles.[1][2] Production began in 2001 at KMDB facilities, featuring a modular chassis that integrates Western components such as a German Deutz BF6M1015 diesel engine producing 326 horsepower and an American Allison transmission for enhanced mobility and reliability.[1][3] The vehicle accommodates a crew of three plus up to six infantry troops, provides fire support via a remotely operated turret typically armed with a 30 mm autocannon, 7.62 mm machine gun, and anti-tank missiles, and maintains amphibious capability through water jets for propulsion.[2] Weighing approximately 16.4 tonnes, the BTR-3 emphasizes troop transport, reconnaissance, and limited combat roles across diverse terrains, with variants like the BTR-3E1 and BTR-3DA incorporating upgraded armor, electronics, and weapon systems for improved survivability against small arms, artillery fragments, and improvised explosive devices.[4][5] Exported to operators including Azerbaijan, Chad, Ecuador, Iraq, Kazakhstan, Myanmar, Nigeria, Thailand, and the UAE, it has been deployed in conflicts such as the Iraq War and Ukraine's ongoing defense against Russian aggression, where Ukrainian forces have utilized it for rapid infantry maneuvers despite production constraints from wartime disruptions.[6][5] Its design prioritizes cost-effective upgrades over tracked alternatives, enabling export success but highlighting vulnerabilities in high-intensity peer conflicts compared to heavier Western counterparts.[1]
Development
Origins and Design Influences
The BTR-3 armored personnel carrier was developed in 2000–2001 by the Kharkiv Morozov Machine Building Design Bureau (KMDB) in Ukraine, in partnership with the State Scientific and Technical Centre of Artillery and Small Arms, as a private-venture project aimed at producing a modern export-oriented vehicle to succeed aging Soviet-era designs.[7] This initiative emerged in the post-Soviet period, when Ukrainian defense enterprises like KMDB, known for tanks such as the T-80UD, sought to adapt inherited expertise to independent production and international markets amid economic constraints and reduced Russian collaboration.[1] Design influences primarily stemmed from the Soviet BTR series (BTR-60, BTR-70, and BTR-80), adopting the proven 8×8 wheeled configuration for enhanced cross-country mobility, amphibious capability, and troop transport in mechanized infantry roles.[1] However, the BTR-3 departed from direct derivatives by employing an all-new hull structure, independent suspension, and a front-mounted powerpack layout to improve ergonomics, visibility, and maintenance over predecessors' tandem-engine vulnerabilities and cramped interiors.[6] These changes prioritized modularity for weapon integration and compatibility with NATO-standard optics and electronics, reflecting a pragmatic evolution toward versatile fire support rather than rigid adherence to Cold War-era mass-production doctrines.[1] The project's emphasis on diesel propulsion—using a Deutz engine in early variants—addressed fuel efficiency shortcomings of Soviet gasoline-powered BTRs, while retaining low ground pressure for operations in varied terrains, underscoring a causal focus on reliability in resource-limited conflicts over heavy armor emphasis.[7] This hybrid approach balanced legacy affordability with incremental upgrades, enabling competitiveness in global tenders without full redesign costs.[6]Prototyping and Initial Testing
The BTR-3 was developed through a collaborative private venture initiated in 2000 between Ukraine's Kharkiv Morozov Machine Building Design Bureau (KMDB) and the United Arab Emirates' ADCOM Manufacturing, with additional input from Ukraine's State Scientific and Technical Center of Artillery and Small Arms.[1][7] This effort built on prior research dating to 1999, focusing on a new turret design, and resulted in the first prototype variant, the BTR-3U "Guardian," tailored to ADCOM's requirements for enhanced infantry transport and fire support capabilities suitable for UAE Marine Corps operations.[7] The prototype incorporated a modified BTR-80 hull with an extended chassis for improved internal volume, eight-wheel drive, and integration of Western-origin systems like a Deutz diesel engine for better reliability over Soviet-era predecessors.[7][8] Prototyping emphasized modular design for export adaptability, including amphibious propulsion via water jets and a centralized tire pressure regulation system for varied terrains.[7] The core vehicle configuration was finalized by 2002, after iterative refinements to armament mounting—such as the optional KBA-2 30 mm cannon—and hull extensions for mortar or command variants.[7] Patent documentation for the prototype design was filed and granted on August 16, 2004, reflecting completed engineering validation.[7] Initial testing occurred at KMDB's in-house facilities near Kharkiv, utilizing a dedicated proving ground equipped with cross-country tracks, paved roads, and specialized benches to assess full-spectrum performance under simulated harsh environments, including temperatures up to +55°C for desert-like conditions.[9] Trials verified mobility metrics, such as climbing 60% gradients, fording 2-meter trenches, and achieving speeds exceeding 80 km/h on roads, alongside amphibious trials confirming water traversal at up to 9 km/h.[7] Firing range evaluations focused on turret stabilization, weapon accuracy during motion, and integration of sighting systems, ensuring the prototype met operational thresholds for troop transport, fire support, and survivability before advancing to production considerations.[9][7]Entry into Production
Serial production of the BTR-3 commenced in 2001 at facilities of the Kharkiv Morozov Machine Building Design Bureau (KMDB) in Ukraine, following prototype development in 2000 through a collaboration between KMDB and ADCOM Manufacturing of the United Arab Emirates.[1][7] The vehicle was initially produced primarily for export, with early units directed toward partner nations rather than immediate domestic adoption by the Ukrainian Armed Forces.[10] By 2006, Thailand placed the first major export order, leading to the delivery of 233 BTR-3E1 variants as part of contracts valued at approximately $270 million across 2006 and 2011 phases.[11] Production totals reached around 415 units overall, with KMDB handling design integration and manufacturing of key components, though full localization of 90% of parts was achieved by Ukrainian enterprises only by early 2015.[12] Domestic deliveries to Ukraine began later, with five units supplied in June 2014 and an additional 50 transferred in 2017 amid heightened demand.[13][14]Design and Features
Chassis and Mobility Systems
The BTR-3 employs an 8×8 wheeled chassis optimized for enhanced mobility over diverse terrains, incorporating a central tire pressure regulation system to adjust tire inflation for improved traction on roads, sand, or mud.[15][1] This configuration, derived from the BTR-80 series but with modernized components, supports powered steering on the front four wheels and enables the vehicle to navigate obstacles up to 0.5 meters high and trenches 1.5 meters wide.[3] Propulsion is provided by a Deutz BF6M1015 air-cooled diesel engine delivering 326 horsepower, paired with an Allison MD3066 fully automatic transmission that facilitates seamless gear shifts and maneuverability.[15][1] The power-to-weight ratio supports a maximum road speed of 85 km/h, with some variants like the BTR-3U achieving up to 100 km/h, and an operational range of 600 km on internal fuel reserves.[15][1][3] Suspension varies by variant; the standard model features independent suspension across all eight wheels for superior ride quality and cross-country performance, while the BTR-3U utilizes torsion bars with hydraulic shock absorbers.[1][3] The vehicle measures 7.65 meters in length, 2.9 meters in width, and 2.8 meters in height, with a combat weight ranging from 16.4 to 18 tonnes depending on configuration and load.[15][1] The BTR-3 is fully amphibious, propelled in water by a single rear-mounted water jet at speeds up to 8 km/h, augmented by a trim vane for buoyancy and bilge pumps to manage water ingress.[15][1][3] An automatic fire suppression system in the engine compartment enhances operational reliability during extended mobility operations.[15]Armament and Weapon Systems
The BTR-3 features a modular armament system centered on a remotely operated turret, allowing for various configurations depending on operational requirements and export specifications.[1] The standard setup utilizes the KBA-105 "Shkval" unified fighting module, which mounts a 30 mm ZTM-1 autocannon as the primary weapon, capable of engaging armored vehicles, infantry, and low-flying aircraft with a rate of fire up to 330 rounds per minute.[15][7] This cannon is paired with a coaxial 7.62 mm KT-7.62 or PKT machine gun for suppressive fire against soft targets.[1][3] Secondary armament often includes a roof-mounted 30 mm AGS-17 automatic grenade launcher for area suppression, positioned to the rear of the turret, along with optional anti-tank guided missiles such as the 9M113M Konkurs-M, providing capability against heavier armor at ranges up to 4 km.[7][3] Ammunition capacity typically comprises 350 to 500 rounds for the 30 mm cannon, 2,000 rounds for the coaxial machine gun, and 29 grenades for the AGS-17, with the system stabilized for firing on the move.[15][1] Export variants may substitute the Shkval with the BM-3 Shturm module, emphasizing ATGMs, or integrate Western systems like the 90 mm Cockerill CSE 90LP gun for enhanced penetration.[16] Defensive measures include six 81 mm smoke grenade dischargers arranged in two banks of three, enabling the crew to deploy obscurant screens for evasion or maneuver.[1] The remote operation of the turret enhances crew safety by allowing control from within the protected hull, with optics including day/night sights and laser rangefinders for target acquisition up to 5 km.[15] Early production models occasionally featured lighter 14.5 mm armament, but field experience prompted the shift to the more potent 30 mm configuration for improved lethality against modern threats.Protection and Armor Configuration
The BTR-3 utilizes an all-welded steel armor hull configured to withstand small-caliber automatic weapon fire, typically up to 7.62 mm projectiles, and artillery shell fragments.[15][18] This baseline ballistic protection applies across the hull and modular turret, with the design prioritizing mobility over heavy armor plating.[1] The hull's angular, sloped frontal and side panels increase effective armor thickness through deflection, offering enhanced resistance to incoming projectiles relative to flat-plate equivalents in predecessor BTR models.[1] Specific armor thickness details are not publicly disclosed by the Kharkiv Morozov Machine Building Design Bureau, but the configuration aligns with light armored personnel carrier standards, lacking composite or reactive elements in the base model.[15] Additional passive protection includes a nuclear, biological, and chemical (NBC) overpressure system for crew and troop compartment isolation, along with an automatic fire suppression system to mitigate internal blazes from impacts or malfunctions.[19] Mine resistance remains limited due to the wheeled chassis and flat underbelly, with no V-shaped hull or dedicated blast deflection features in standard configurations; variants like the BTR-3M1 incorporate STANAG Level 2 ballistic and partial mine blast enhancements.[20] In Ukrainian service as of 2025, field modifications such as custom anti-drone mesh netting have been added to select BTR-3 units to counter unmanned aerial vehicle threats, preserving operational mobility while addressing asymmetric risks not covered by the original armor scheme.[21]Internal Layout and Capacity
The BTR-3 maintains a standard armored personnel carrier configuration with a crew of three—consisting of a driver, commander, and gunner—and capacity for six fully equipped infantrymen in the troop compartment, for a total internal occupancy of nine personnel.[15][16][8] This arrangement prioritizes mechanized infantry transport while supporting fire missions from the vehicle's armament, though troop capacity can vary slightly by variant or mission-specific modifications such as added equipment stowage.[16] The internal layout positions the crew compartment forward, with the driver seated on the left and the commander on the right, both accessing external visibility through armored glass windshields and periscopes; the gunner operates from an overhead turret housing the primary weapon system.[1] Behind the crew area lies the central troop compartment, where infantrymen are seated along the hull sides on bench-style accommodations facing inward, equipped with individual firing ports and hatches for dismounted operations.[1][22] The engine and transmission are mounted aft, relocating powerplant components to the rear unlike predecessor BTR-80 designs, which frees additional central space for troops and reduces exposure to frontal impacts.[22] Access to the troop compartment occurs primarily through a rear door or ramp, supplemented by side doors and roof hatches for rapid egress under combat conditions, with integrated vision blocks and weapon ports enabling troops to engage threats without full dismount.[8] The design incorporates modular storage for personal equipment, ammunition reserves, and supplies within the compartment walls, while maintaining overpressure for nuclear, biological, and chemical (NBC) protection across occupied spaces.[15] This setup balances capacity with operational flexibility, though the fixed seating limits reconfiguration for specialized roles without external modifications.[16]Variants
Standard Ukrainian Variants
The BTR-3U serves as the foundational standard variant of the BTR-3 armored personnel carrier produced in Ukraine, developed between 2000 and 2001 by the Kharkiv Morozov Machine Building Design Bureau (KMDB) in collaboration with international partners.[3] This 8x8 wheeled vehicle accommodates a crew of three and up to six troops, equipped with a Deutz BF6M1015 diesel engine providing enhanced mobility over predecessors like the BTR-80, achieving speeds up to 100 km/h on roads and amphibious capability at 8 km/h.[3] Armament typically includes a 30 mm autocannon, coaxial 7.62 mm machine gun, and optional anti-tank guided missiles in the Shkval or similar turrets, with steel armor protection against small arms and fragments.[3] The BTR-3DA represents an upgraded iteration tailored for Ukrainian service, entering operational use with the Armed Forces and National Guard around November 2015.[5] Manufactured by the Kyiv Armored Plant, it features the BM-3M Shturm-M combat module armed with a 30 mm ZTM-1 cannon, 7.62 mm machine gun, grenade launcher, and Barrier anti-tank missiles effective up to 5,000 m, supplemented by thermal imaging for night operations.[5] Retaining the Deutz diesel engine for a top speed of 104 km/h and 600 km range, the BTR-3DA underwent acceptance tests and deliveries starting in 2017, including batches of five units to the Army in August 2017 and 50 units to the Army and National Guard by December 2017.[5] Further testing by the 95th Air Assault Brigade occurred in July 2019, affirming its role in Ukrainian mechanized units.[5] While the BTR-3E variant exists with a UTD-20 engine for compatibility with Soviet-era logistics, it remains less common in standard Ukrainian inventories compared to the Deutz-powered BTR-3U and BTR-3DA, which prioritize modern powertrains for improved reliability and performance.[3] These variants emphasize infantry transport, fire support, and reconnaissance, produced domestically to meet national defense requirements amid ongoing conflicts.[5]Export and Modified Versions
The BTR-3 has achieved notable export success, with primary customers including Myanmar, Thailand, the United Arab Emirates, Azerbaijan, Nigeria, Kazakhstan, Ecuador, Chad, and Iraq.[1] The largest contract was signed with Myanmar in 2004 for up to 1,000 BTR-3U units, intended for local assembly, though deliveries totaled at least 210 complete vehicles by late 2019, with additional kits supplied for production.[1] [23] Thailand received its initial batch of 96 BTR-3E1 vehicles starting in September 2010, comprising various sub-variants such as armored personnel carriers, command posts, ambulances, and mortar carriers; an additional order for upgraded models followed in 2013.[11] Export variants incorporate modifications tailored to customer requirements, often featuring enhanced engines, turrets, and electronics for improved performance in diverse environments. The BTR-3E1, supplied to Thailand, mounts the BM-3 "Shturm" remote-controlled turret with a ZTM-1 30 mm autocannon, coaxial 7.62 mm machine gun, and six 81 mm smoke grenade launchers, powered by an MTU 6R106 TD21 diesel engine for better reliability over the baseline Deutz unit.[15] [11] The BTR-3U, oriented toward Myanmar's assembly line, uses a Shakval one-man turret armed with a 30 mm KBA-3 cannon, coaxial 7.62 mm PKT machine gun, and optional 30 mm AGS-17 grenade launcher, retaining the Deutz BF6M1015 engine but with adaptations for tropical climates and local maintenance.[3] Further modifications for export include command and reconnaissance roles, such as Thailand's BTR-3RK reconnaissance variant and BTR-3CS armored command post carrier unveiled in 2019, which integrate advanced communication suites and collaborative production elements with Ukrainian firms.[11] [24] The BTR-3E series emphasizes a Ukrainian UTD-20 engine for export markets seeking domestic powerplant compatibility, while retaining amphibious capability and 8x8 wheeled mobility across variants.[7] These adaptations prioritize interoperability with existing fleets, such as integrating UAE-developed electronics from the original consortium involving ADCOM Manufacturing and Kharkiv Morozov Machine Building Design Bureau.[1]Operators and Deployment
Ukrainian Armed Forces
The BTR-3 armored personnel carrier entered service with the Ukrainian Armed Forces in 2001 as a domestically produced upgrade over Soviet-era BTR-60/70/80 designs, featuring improved mobility, amphibious capability, and a stabilized remote weapon station.[25] Developed through a collaboration between Ukraine's Kharkiv Morozov Machine Building Design Bureau and international partners, variants such as the BTR-3U (optimized for Ukrainian conditions with a Deutz diesel engine) and BTR-3DA (with enhanced armor and digital systems) were prioritized for mechanized infantry units.[5] These vehicles provide troop transport for up to 10 personnel, fire support via a 30 mm autocannon, and integration with anti-tank missiles, though procurement remained limited compared to legacy BTR-80 stocks due to production constraints and competing modernization priorities.[26] Deliveries to the Armed Forces and National Guard included five BTR-3E units in June 2014 amid the onset of the Donbas conflict, followed by over 50 BTR-3 vehicles transferred by state-owned UkrOboronProm in early 2017.[13] An additional 50 BTR-3DA variants were supplied by the Kyiv Armored Plant in December 2017, bolstering frontline mechanized capabilities.[5] Total active inventory remains modest, estimated in the low hundreds at peak, with units distributed across mechanized brigades for reconnaissance and infantry support roles alongside BMP and Western-donated vehicles.[26] In deployment, BTR-3s participated in the Anti-Terrorist Operation in Donbas from 2014, providing mobile fire support in eastern Ukraine.[27] During the full-scale Russian invasion starting February 2022, they were employed in defensive operations, including near frontline areas like Hnutove, where OSCE monitors documented their presence.[28] By September 2025, Ukrainian forces adapted BTR-3s with custom anti-drone mesh netting to counter UAV threats, preserving operational mobility while addressing vulnerabilities exposed in attritional combat.[21] Despite their relative scarcity, the vehicles have proven useful in hybrid maneuver tactics, though high attrition rates from Russian artillery and drones have strained availability.[27]International Operators
The BTR-3 has been exported to multiple countries since the early 2000s, with Myanmar receiving the largest fleet through a combination of direct deliveries and local assembly from kits.[23] The United Arab Emirates, a co-developer via Adcom Manufacturing, fields the BTR-3U Guardian variant equipped with the Buran-N1 turret for marine forces.[1] Thailand operates BTR-3E1 units, including armored command post carriers like the BTR-3CS (ACPC-01), with additional orders of 21 vehicles fulfilled in 2013 as part of a collaborative production program.[11][24] Iraq, Nigeria, and other nations maintain operational BTR-3 fleets for armored personnel carrier roles, though specific quantities remain undisclosed in public records.[1] Smaller operators include Azerbaijan with six BTR-3 units armed with heavy machine guns, Chad with 12 BTR-3E variants, Kazakhstan with two BTR-3E, and Ecuador with three BTR-3U ordered.[1][7] These exports highlight the vehicle's appeal in diverse operational environments, from amphibious assaults to internal security.[15]| Country | Quantity | Variant(s) | Acquisition Notes |
|---|---|---|---|
| Myanmar | 500+ | BTR-3U | Kits for local assembly; contracts from early 2000s, batches delivered through 2013.[7][23] |
| Thailand | Dozens | BTR-3E1, BTR-3CS | Ongoing production partnership; 21 additional in 2013.[11] |
| Azerbaijan | 6 | BTR-3 | Equipped with HMGs.[7] |
| Chad | 12 | BTR-3E | Standard APC configuration.[7] |
| Ecuador | 3 | BTR-3U | Ordered; delivery status unclear.[7] |
| Iraq | Unknown | BTR-3 | In service for mechanized units.[1] |
| Kazakhstan | 2 | BTR-3E | Limited deployment.[7] |
| Nigeria | Unknown | BTR-3 | Used in counter-insurgency operations.[1] |
| United Arab Emirates | Unknown | BTR-3U Guardian | Co-developed; marine-focused.[1] |
Combat History
Early Deployments and Conflicts
The BTR-3 entered operational service primarily through exports in the early 2000s, with initial deployments focusing on internal security and border patrol roles rather than large-scale conventional warfare. Myanmar placed the first known contract in 2003 for 10 BTR-3U variants, followed by additional procurements that eventually exceeded 1,000 units by the mid-2010s.[29] These vehicles supported the Myanmar Army in counter-insurgency operations against ethnic armed groups and in border security missions, providing enhanced mobility over rugged terrain compared to older wheeled APCs.[23] Nigeria acquired BTR-3 APCs in the early 2010s, with the first verified imagery of the vehicles in Nigerian Army service emerging in 2013.[30] Deployed in the northeast against Boko Haram insurgents, the BTR-3 offered infantry transport, reconnaissance, and fire support capabilities, including its 30 mm autocannon for engaging lightly armored threats and fortified positions.[31] Nigerian units utilized the APCs in joint operations to clear insurgent-held areas, where its amphibious features aided riverine maneuvers in flood-prone regions.[1] Other early adopters, such as Thailand and the United Arab Emirates, integrated BTR-3 variants into marine and rapid reaction forces by the late 2000s, primarily for territorial defense and amphibious exercises, though documented combat exposure remained limited prior to regional escalations.[15] These deployments highlighted the vehicle's versatility in non-Western theaters, where maintenance challenges and adaptation to local conditions tested its reliability in austere environments.[23]Use in the Russo-Ukrainian War
The BTR-3 has been deployed by the Ukrainian Armed Forces since the Russian full-scale invasion began on February 24, 2022, serving primarily as an armored personnel carrier for infantry transport and fire support in mechanized operations across eastern Ukraine. Equipped with a 30 mm autocannon in the BM-3 "Shturm" turret, it has provided suppressive fire against Russian positions, capitalizing on its wheeled mobility for rapid redeployment in contested areas like Donetsk Oblast. Ukrainian units have integrated the vehicle into brigade-level maneuvers, where its amphibious capabilities aid in riverine or flooded terrain common in the theater.[27] Notable engagements include operations by the 95th Separate Air Assault Brigade near Pivnichne village in Donetsk Oblast in July 2024, where BTR-3s engaged Russian forces with direct cannon fire, demonstrating its role in close-quarters support amid intense artillery and drone activity. To address vulnerabilities exposed by Russian FPV drones and loitering munitions, Ukrainian technicians fitted BTR-3s with custom anti-drone mesh netting by September 2025, designed to fit the vehicle's hull without impeding turret traverse or speed. This adaptation reflects broader efforts to sustain legacy wheeled APCs against evolving aerial threats in prolonged attritional warfare.[32][21] Russian forces have captured a limited number of BTR-3s during advances, with reports confirming several units repurposed for their own operations or preserved as trophies, including one BTR-3E displayed in a private military museum near Moscow by September 2024. Visual confirmation of destroyed BTR-3s remains sparse in open-source intelligence, suggesting either restrained deployment relative to tracked alternatives or effective operational security, though captures indicate exposure to Russian anti-armor systems in breakthrough attempts.[27][33]Performance Analysis
The BTR-3 demonstrates strong mobility characteristics due to its 8x8 wheeled configuration and Deutz BF6M1015C diesel engine producing 326 horsepower, coupled with an Allison automatic transmission, enabling a maximum road speed of 85 km/h and amphibious capability at 8 km/h via twin water jets.[15][1] This setup provides superior strategic mobility and reliability over gasoline-powered Soviet-era BTR predecessors, reducing fire risks and supporting sustained operations in varied terrains, though its wheeled suspension limits severe off-road performance compared to tracked vehicles like the BMP series.[15][7] Protection levels rely on all-welded steel armor offering resistance to 7.62 mm rounds all-around and up to 12.7 mm frontal impacts in base configurations, with optional Kevlar spall liners and add-on bar armor enhancing survivability against shaped charges.[5][34] In the Russo-Ukrainian War, Ukrainian forces have adapted BTR-3s with custom anti-drone mesh netting to counter FPV UAV threats, preserving operational mobility while addressing aerial vulnerabilities inherent to lightly armored wheeled APCs.[21] However, the design's emphasis on volume and speed over thick armor renders it highly susceptible to anti-tank guided missiles, RPGs, and artillery fragments, contributing to elevated loss rates in peer-level conflicts where top-attack and precision munitions dominate.[5] Firepower varies by variant but typically includes a 30 mm KBA-2 autocannon with 400-700 rounds, paired with a coaxial 7.62 mm machine gun and optional anti-tank missiles, enabling effective suppression of infantry and light vehicles at ranges up to 4 km.[1] This armament supports mechanized infantry tactics by delivering direct fire support during dismounts, outperforming basic BTR-80s in lethality. Operational effectiveness shines in rapid maneuver scenarios or low-threat environments, as evidenced by export deployments in Chad and Nigeria for counter-insurgency, but diminishes in contested battlespaces against combined arms threats, where its light protection prioritizes troop transport over sustained combat endurance.[5][35]| Aspect | Key Metrics | Limitations |
|---|---|---|
| Mobility | 85 km/h road; amphibious | Inferior cross-country traction vs. tracks |
| Protection | 7.62 mm all-around; add-on kits | Vulnerable to ATGMs, drones, HEAT |
| Firepower | 30 mm cannon + MG | Limited vs. armored targets without ATGMs |
| Capacity | 3 crew + 6-7 troops | Exposed dismounts in high-threat zones |
Upgrades and Modernizations
Engine and Mobility Enhancements
The BTR-3's powertrain represents a key modernization over Soviet-era BTR predecessors, replacing gasoline engines with diesel units for greater torque, efficiency, and reduced fire risk. The standard configuration employs a Deutz BF6M1015 air-cooled, turbocharged diesel engine rated at 326 horsepower, integrated with an Allison MD3066 six-speed automatic transmission, which facilitates smoother operation across varied speeds and reduces driver workload during maneuvers.[15][1] This setup yields a maximum road speed of 85 km/h, a cruising range of 600 km on internal fuel, and amphibious traversal at 8 km/h via a single rear water-jet propulsor.[15] The BTR-3DA variant, procured by the Ukrainian Armed Forces from 2017 onward and tested by the 95th Air Assault Brigade in 2019, incorporates an upgraded Deutz BF6M1015CP water-cooled V6 diesel engine coupled to an Allison 3200SP automatic transmission.[5] These modifications elevate top speed to 104 km/h while preserving the 600 km range, enhancing rapid response capabilities in dynamic combat environments.[5] In variants like the BTR-3E1, oriented toward export markets such as Thailand, the UTD-20 rear-mounted diesel engine drives a mechanical transmission, achieving 95 km/h on roads and 5 km/h in water, with provisions for easier integration of Ukrainian-sourced components to mitigate supply chain dependencies.[19] Common mobility upgrades across modernized BTR-3 series include an 8x8 chassis with independent torsion-bar suspension, central tire pressure regulation for optimized traction on soft or uneven ground (supporting 30° gradients and 25° side slopes), and run-flat tire technology for sustained post-damage mobility.[15][19] Amphibious performance is augmented by the water-jet system and trim vanes, enabling unassisted water entry and operation without preparatory reconfiguration.[5] These features collectively improve power-to-weight ratios (approximately 18-20 hp/tonne depending on configuration) and cross-country agility, addressing limitations in older wheeled APCs.[1]Defensive Adaptations Against Modern Threats
In response to the proliferation of first-person-view (FPV) drones and loitering munitions in contemporary conflicts, particularly evident in the Russo-Ukrainian War, Ukrainian forces have implemented custom anti-drone mesh armor on BTR-3 vehicles. This adaptation, introduced in September 2025, consists of tailored protective netting designed to intercept and detonate incoming drone payloads before they contact the hull, preserving mobility and operational effectiveness.[21][36] The mesh is integrated without significantly impeding the vehicle's 8x8 wheeled configuration or its Deutz diesel engine's performance, addressing vulnerabilities exposed by drone strikes that have targeted lighter armored personnel carriers.[21] To counter anti-tank guided missiles (ATGMs) and rocket-propelled grenades (RPGs) employing shaped-charge warheads, some BTR-3 variants have been fitted with slat armor, or "cage" structures, which create a standoff distance to disrupt fuze initiation and prematurely detonate the explosive liner. These additions, observed on Ukrainian BTR-3/3E models deployed frontline, enhance protection against common threats like the RPG-7 without adding excessive weight that could compromise the vehicle's 70 km/h top speed or amphibious capabilities.[37] However, slat armor's efficacy is limited against tandem-warhead munitions or top-attack ATGMs, such as the Kornet, necessitating complementary tactics like electronic warfare jammers.[38] Further defensive measures include appliqué steel or composite panels on vulnerable areas like the sides and roof, aimed at mitigating fragmentation from artillery and improvised explosive devices (IEDs), though these do not elevate the BTR-3's base ballistic protection beyond STANAG Level 2 equivalence against small arms.[39] No verified implementations of explosive reactive armor (ERA) exist on production BTR-3s, as the vehicle's aluminum hull and modular design prioritize speed over heavy add-ons, rendering ERA impractical due to potential structural damage upon detonation.[40] These adaptations reflect pragmatic, field-driven responses to asymmetric threats rather than comprehensive overhauls, with ongoing evaluations highlighting trade-offs in visibility and maintenance.[41]Assessment and Criticisms
Operational Strengths
The BTR-3's 8x8 wheeled configuration, combined with independent suspension and central tire-pressure regulation, provides excellent cross-country mobility, enabling operations across diverse terrains including mud, sand, and snow.[1] [5] It achieves a maximum road speed of 104 km/h and an operational range of 600 km on a single tank of fuel, facilitating rapid troop deployment and sustained maneuvers without frequent refueling.[5] Amphibious capabilities further enhance its versatility, with water jet propulsion allowing traversal of rivers and coastal waters at speeds up to 10 km/h, a feature that outperforms many contemporary wheeled APCs in combined arms operations involving water barriers.[1] [5] Powered by a Deutz BF6M1015 diesel engine delivering 326 horsepower, paired with an Allison automatic transmission, the BTR-3 exhibits greater reliability and lower flammability risk than predecessor models like the BTR-80, which relied on less stable gasoline engines; this modern powerpack supports consistent performance in extended field use with reduced downtime for maintenance.[1] Modular armament options, including the KBA-105 Shkval turret with a 30 mm ZTM-1 autocannon firing at 330 rounds per minute, coaxial 7.62 mm machine gun, and provision for anti-tank guided missiles like the Barrier with a 5 km range, enable the vehicle to deliver suppressive fire and engage armored threats, augmenting infantry firepower during assaults.[5] The all-welded steel hull provides baseline protection against small arms fire and artillery fragments, while accommodating 3 crew members and 6 dismounted troops, optimizing troop transport with quick egress via side doors and roof hatches for tactical flexibility in combat.[5] In Ukrainian operations since 2014, these attributes have supported effective fire support and mobility in dynamic frontline conditions.[5]Vulnerabilities and Limitations
The BTR-3's hull, constructed from all-welded steel armor, provides protection primarily against small-arms fire up to 7.62 mm caliber and artillery shell splinters, but offers negligible resistance to heavier threats such as 14.5 mm armor-piercing rounds, rocket-propelled grenades (RPGs), or anti-tank guided missiles (ATGMs).[15][18] This baseline protection level, equivalent to NATO STANAG 4569 Level 1 in frontal arcs at close range, exposes the vehicle to catastrophic damage from shaped-charge warheads, which can penetrate the thin plating (typically 5-10 mm equivalent rolled homogeneous armor) and ignite internal ammunition or fuel stores.[15] Mine and improvised explosive device (IED) resistance is particularly deficient, owing to the vehicle's 8x8 wheeled suspension, relatively low ground clearance of approximately 0.4 m, and flat underbelly without a V-shaped hull or dedicated blast-deflecting features.[1] In environments with buried anti-vehicle mines or roadside IEDs, such as those encountered in the Russo-Ukrainian War, the BTR-3 risks mission-kill or total destruction from even low-yield explosions, as the wheels and undercarriage transmit blast forces directly into the troop compartment, potentially causing hull breaches and crew casualties.[42] This vulnerability mirrors broader shortcomings in legacy wheeled APC designs, where off-road pressure on tires exacerbates blast effects without the redundancy of tracks. Exposure to aerial threats has proven acute in recent conflicts, with the BTR-3's open-top roof and minimal overhead armor making it highly susceptible to top-attack munitions from first-person-view (FPV) drones carrying RPG warheads or grenades. Ukrainian forces have responded by retrofitting custom metal mesh cages to intercept incoming projectiles, underscoring the original design's inadequacy against low-cost, precision-guided ordnance that exploits the vehicle's high silhouette and lack of active protection systems.[21][36] Operational analyses of losses in Ukraine indicate that such vehicles suffer disproportionate attrition when operating without infantry screens or in uncontested airspace, as drones can disable mobility or detonate internals via roof penetrations.[43] Additional limitations include constrained troop egress under fire, with entry/exit primarily via rear ramps or side doors that become bottlenecks during evasive maneuvers, and reduced cross-country mobility compared to tracked counterparts, as the wheeled drivetrain struggles in mud, snow, or debris-laden terrain despite amphibious capability. These factors, rooted in the design's Soviet-era lineage, limit the BTR-3's utility in peer-level mechanized warfare, where sustained exposure to combined arms threats—artillery, loitering munitions, and ATGMs—results in high loss rates without extensive modifications.[1][5]Comparative Effectiveness
The BTR-3 offers improved mobility over its predecessor, the BTR-80, due to its Deutz BF6M1015 diesel engine producing 326 horsepower, enabling a maximum road speed of 85–104 km/h and a range of 600 km, compared to the BTR-80's less reliable Kamaz engine limited to around 80 km/h.[5][1] This wheeled 8x8 configuration prioritizes road and amphibious performance with a single water jet propulsion system, but sacrifices off-road traction relative to tracked vehicles like the BMP-2, which achieves superior cross-country maneuverability despite a lower top speed of 65 km/h.[44] In combat scenarios, such as Ukrainian operations against Russian positions, the BTR-3's speed has supported rapid fire support roles with its optional 30mm ZTM-1 autocannon, but wheeled designs have shown higher vulnerability to terrain-induced immobility under fire compared to tracked BMP series vehicles.[32] Armor protection on the BTR-3 consists of all-welded steel providing baseline resistance to small arms fire (up to 7.62mm all-around) and shell splinters, with frontal enhancements in some variants against 12.7mm rounds, but it lacks the composite or add-on armor of Western counterparts like the Stryker, which meets STANAG 4569 Level 1–4 standards with slat cages against RPGs.[18][45] Empirical losses in the Russo-Ukrainian War highlight this limitation, as BTR-3s, like Russian BTR-82As, have been frequently disabled by ATGMs and FPV drones without extensive field modifications such as anti-drone mesh, underscoring a shared wheeled APC vulnerability to modern precision threats absent in heavier IFVs.[21][46] Firepower configurations elevate the BTR-3 beyond basic APCs, with the BM-3M turret integrating a 30mm cannon (330 rounds per minute), coaxial 7.62mm machine gun, and up to four anti-tank guided missiles (e.g., Barrier with 5 km range), rivaling the BMP-2's standard armament but exceeding the BTR-80's heavy machine gun-only setup.[5][7] This modularity allows infantry fighting vehicle-like engagement of light armor and personnel, as demonstrated in Ukrainian tactical exercises and limited frontline use, though ammunition capacity (around 200–300 rounds for the cannon) limits sustained fire compared to the Stryker's remote 12.7mm or 30mm systems with greater stabilization and optics.[5] In peer comparisons, the BTR-3's cost-effectiveness—estimated at under $2 million per unit—provides developing operators with enhanced lethality over legacy Soviet designs, but operational reviews note reliability gains from Western components are offset by maintenance challenges in high-intensity conflicts.[27][47]| Aspect | BTR-3 | BTR-82A (Russian) | BMP-2 (Tracked IFV) | Stryker (8x8 Wheeled) |
|---|---|---|---|---|
| Protection | Small arms/shell splinters | Small arms, improved frontal | 14.5mm AP, some AP rounds | STANAG Level 1–4 w/add-ons |
| Mobility | 85–104 km/h, amphibious | 100 km/h, amphibious | 65 km/h, superior off-road | 100 km/h, limited amphibious |
| Firepower | 30mm cannon + ATGMs (optional) | 30mm BPPU standard | 30mm + ATGMs standard | Remote 12.7/30mm optional |
| Crew/Troops | 3 + 6 | 3 + 7 | 3 + 7 | 3 + 9 |
References
- https://www.globalsecurity.org/military/world/[ukraine](/page/Ukraine)/btr-3e1.htm
