"The T-90M is an improved version of the T-90 tank. Sometimes this tank is referred as "Proryv-3" (Breakthrough-3). The upgraded T-90M tank has improved armor protection.
It uses Relikt built-in Explosive Reactive Armor (ERA) in place of the previous Kontakt-5. It provides protection against tandem warheads and significantly reduces penetration of APFSDS rounds. The T-90M is fitted with rubber side skirts with built-in armor plates. Some areas of the tank are covered by a cage armor and special net, that improves protection against certain types of anti-tank weapons.
The T-90M is armed with a new 2A46M-4 gun, which has longer range and is 15-20% more accurate than the standard gun of 2A46M gun of the T-90. It uses the same 125 mm ammunition as other Russian main battle tanks. It fires APFSDS, HE and HE-FRAG rounds.
This tank is powered by a V-92S2 multi-fuel diesel engine, developing 1 000 hp. It is also fitted with auxiliary power unit, which powers all systems, when the main engine is turned off."