Stalin was as much a despot as Hitler and an imperialist himself, had his eyes on all of Europe under the communist banner. Stalin learned in June of 1941 when you lay down with dogs you got up with fleas. Proof of that was the German/Soviet Non-Aggression Pact of August 1939.
Distrust among flip-flop allies with their own national interests was more the cause of the lack of gratitude and openess and not that the USSR had an unfair burden of war effort. The western allies were fighting two enemies, the Soviets but one, refusing assistance in Asia until it was to their benefit of imperialism.
For example, Churchill understood the Soviet threat to Europe far better than Roosevelt and Truman not at all. Once the British interests were secure in the Middle East and Africa Churchill was only to willing to negotiate a peace with Hitler and throw Stalin to the wolves. So the distrust. So there may not have been a second front at all. Roosevelt sank that idea with the demand for "unconditional surrender". Churchill needing to rebuild the British Empire post war had to fall in line.
War makes strange allies. They can all keep their thank yous IMHO.
: ..amongst the headstones--metaphorically and
: otherwise--of some 4 million German troops.
: Without that, there is little doubt the
: failed housepainter would have managed a far
: more robust defense of Western Europe, to
: the detriment of all concerned.
: Randy Stone