The M1 Abrams is an American third-generation main battle tank. It is named after General Creighton Abrams, former Army chief of staff and commander of the United States military forces in the Vietnam War from 1968 to 1972.
Highly mobile, designed for modern armored ground warfare, the M1 is well armed and heavily armored. Notable features include the use of a powerful multifuel turbine engine, the adoption of sophisticated composite armor, and separate ammunition storage in a blow-out compartment for crew safety.
Weighing nearly 68 short tons (almost 62 metric tons), it is one of the heaviest main battle tanks in service. (Wikipedia)
The T-90 is a third-generation Russian battle tank that entered service in 1993. The tank is a modern variation of the T-72B and incorporates many features found on the T-80U. Originally called the T-72BU, but later renamed to T-90, it is the most advanced tank in service with Russian Ground Forces and the Naval Infantry.
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, smoke dischargers, Kontakt-5 explosive-reactive armour, laser warning receivers, Nakidka camouflage and the Shtora infrared ATGM jamming system.
Since 2011, the Russian armed forces have ceased any further orders for the T-90 and are anticipating the development of the T-14 Armata that is expected to enter service in 2016. (Wikipedia)