40th Motorized Infantry Battalion is a formation of the Ukrainian Ground Forces. It was originally formed as the 40th Territorial Defence Battalion Kryvbas in Kryvyi Rih.

On March 18, 2014, after the military invasion Russia to Crimea and his annexation, partial mobilization began in Ukraine.

On April 13, 2014, the military actions of war in the east began, after capturing the Sloviansk Donetsk region by Russian sabotage detachments under the command of Igor Girkin. On April 30, 2014, acting President of Ukraine Oleksandr Turchynov instructed the heads of regional administrations to start creating territorial defense battalions in each region of Ukraine. The functions of creating battalions were assigned to the authorities and military commissariats.

On May 15, 2014, the 40th Territorial Defense Battalion began to form. Measures began on May 20, and equipment and techniques helped the city authorities of Kryvy Rih.

On June 26, the battalion fighters during the raid in the vicinity of Donetsk captured two persons with the weapons and documents of the DNR called sign Klotz (deputy Igor Girkin, the Russian field commander), and the Donetsk militiaman Sergey Tishchenko, which took direct part in the operations of militants. Klotz had numerous keys to apartments and notarial acts recorded on his real estate in Donetsk and its region.

On July 3, 2014, the terrorist attack on the checkpoint is reflected; six militants were killed, two cars were captured as well as a significant amount of weapons.

On July 23 during an inspection at checkpoints in the area of Amvrosiyivka, a BRDM hit a radio-controlled bomb. After the explosion, mortally wounded Roman Krakovetskiy managed to bring the BRDM from the zone of fire.

On August 4, 2014, the unit reported an event at the checkpoint of the battalion Kryvbas. During the breakthrough, a "suicide bomber" was eliminated, whose purpose was to destroy checkpoints and peaceful inhabitants, later evacuated from the fire of Donetsk.