The soviets were also the enemy, going back to the Russian revolution and US participation in the counter-revolutionary invasions. They were simply an ally of convenience for the relatively brief period between the end of the Molotov-von Ribbentrop pact to cessation of hostilities in Europe.

Remember Patton wanted to rush to Berlin and the. Keep on going to Moscow — that was the enemy he had been trained to hate.

And this was quite effective for the other allies — they shipped materiel to the USSR who in exchange did the majority of the actual fighting. Not to discount the efforts of the western allies, but the level of USSR fatalities was enormous, while Eisenhower (a logistics specialist, not a tactician) delayed the proposed invasion for anyear in order to get his supply lines in order and to minimize casualties for his side.