Well, not "all of Europe" was attacking USSR, Germany had fronts also towards Britain as well as North Africa, and USSR did get an immense amount of material su

Well, not "all of Europe" was attacking USSR, Germany had fronts also towards Britain as well as North Africa, and USSR did get an immense amount of material support from the USA. It is quite clear that USSR's surprisingly weak performance in Winter War did encourage Hitler to think that he could crush Soviets with a quick summer war.