According to Wikipedia: "After the dissolution of the USSR, Ukraine carried on the development of T-64 modernization, as the original and main factory was in this country. Two different upgrade packages were developed in 1999.
T-64BM2, with a 57DFM 850-hp (625 kW) engine, a new 1A43U fire control, a new 6ETs43 loader and the possibility to fire the 9M119 missile (NATO code "AT-11 Sniper").
T-64U which integrated on top the 1A45 fire control (from the T-80U and T-84), PNK-4SU and TKN-4S optics for the tank commander and PZU-7 for the AA machine gun. The tank leader is then able to drive the tank and to use the gun directly if needed. Kontakt-5 Armor added few prototypes build."