India's indigenous MBT, the Arjun, has entered service with the Indian Army, and is superior to the T-90 in terms of firepower, FC systems and survivability (because it was designed along the lines of current generation Western MBTs). The Indian army babus preferred the T-90 (export model) anyway because they get the monetary kickbacks from it.
One particularly nasty disadvantage of previous and current generation Soviet / Russian MBTs is the tendency of the turret to be blown clear of the hull if a satchel charge is detonated directly beneath it, because the ammo is stored in the gunner's room instead of a separate sealed compartment.
as a former tanker that is the foirst time i have heard of the turrt (or fighting compartment in a non turret tank destroyer (ww2)) referred to as the gunner’s room.
many a penetrating round into the fighting compartment of a russian tank will set off the on board ammo and blow the turret off.i was in m60a2 missle tanks in the 70’s and we had combustable cartridge ammunition in the tirret. it was protected by asbestos sleeves but still.