My understanding is that Soviet tanks are built significantly lighter and smaller than the Abrahms because the Soviets weren't capitalism brained dipshits and actually considered what weights the bridges and roads their tanks were intended to operate on could stand. Also, apparently the US only has like one or five bridgelayers capable of deploying bridges the abrahms can cross. The thing will not have good manuervability in Eastern Europe while mobility was made an important design constraint for Soviet armor.