BM Bulat Main Battle Tank - Ukraine The BM Bulat main battle tank (MBT), also known as Obyekt 447AM-1, is a modernised version of the T-64B MBT. The upgraded T-64B tank has been designed to meet the technical and combat characteristics of a modern tank. With a crew of three, it has a combat weight of 45t. The BM Bulat has a maximum speed of 70km/h and range of 385km. In Action Some apparently were found in action against mostly T-72s of the Russian insurgents in the eastern region of the Donbass