Hi, might I suggest the modern armour to be T-72M1 tank instead of the Joseph Stalin tank. Joseph Stalin tank series was an outdated unit during the information era (Came during the atomic era for a short period of time).

The soviets concentrated on mass-producing the cheap but powerful T-series tank (Ex. T-64, T-72, T-80) at that time and exported to Iran, Iraq, and other Middle Eastern counties.

http://www.military-today.com/tanks/t72.htm