The T-90 is a tank and represents a moderate evolution of the T-72B, incorporating many features of the T-80U (it was originally called the T-72BU, later renamed to T-90). It is currently the most advanced tank in service with the Russian Ground Forces and Naval Infantry. Although derived from the T-72, the T-90 uses a 125 mm 2A46 smoothbore main gun, the 1A45T fire-control system, an uprated engine, and thermal sights. Standard protective measures include a blend of steel, composite armour, smo