Rick said

D-Day would've turned out a lot differently (and may not have happened at all) had the Russians not taken on the brunt of the German army, giving as well as receiving staggering losses, and defeating them at Stalingrad.

That the Russians took the brunt of the Nazi war machine and won can't be argued. The fact that Stalin sent thousands of these Red Army soldiers to die in concentration camps after being "infected" by contact with their Western Allies is one of the most disgusting occurrences of the War, and worthy of that other Great Dictator of the era, Herr Hitler.