lego T34/76 the german nightmare , the surprising encounter during barbarossa attack !!!
it was the best ww2 tank with new design ( sloped armor , big 76mm maingun ,with wide treads usefull in mud and snow conditions , reliable by 1942 , easy repaired and maintained , good range )
guderian says if Russia is able to produce them in mass we will loose the war !!!
so Soviet did :-)