http://www.youtube.com/watch?v=FHHfA2BuNxQ
The T-80UD variant.
The T-80 main battle tank has been in production since the late
1970s. KBTM of Omsk, Russian Federation, manufactures the T-80U for
general use in infantry and tank units and the T-80UK command tank
and XKBM, Kharkov, Ukraine, manufactures the T-80UD and the T-84.
320 T-80UD tanks have been ordered from Ukraine by Pakistan, and
are being delivered. In August 2002, it was announced that South
Korea is to purchase from Russia a number of T-80 tanks.

They were deployed to East Germany in the 1970's and made up the
main force expected to break through to West Germany if a war
began. NATO was expecting T-72 tanks, and likely thought the T-64
in East Germany was the T-72. Earlier NATO Armor Piercing rounds on
their tanks would have likely failed to defeat the Armor of the
T-64B model for example. US 105mm M774 and M833 and early 120mm
M829 APFSDS rounds had penetration characteristics(at highest
velocity) which were less than the front armor of the T-64B.
Penetrating 300mm of Iraqi export variant T-72 Armor was far
easier.
Feather