>>>As you know, the Russians "liberated" the vast majority of the European continent including a large chunk of Germany. FDR and Churchill were in a real pickle because with Russians occupying most of Europe and given their vast commitment to the war, they were in a difficult negotiating position. THere is conjecture that Churchill wanted to drop a few nukes on Russia at the time to enforce new terms but FDR, as sick as he was and trying to bring a close to the war on Japan was reluctant to open a new western front.<<<
I believe it's a stretch to say Russia 'Liberated Poland' or any of the Eastern Block Countries :).
Also if the US hadn't landed in N. Africa in Nov. of 42 and forced the NAZI's to commit so many divisions to the Med. and relieve the pressure on the Ruskies on the Eastern Front history might well have turned out differently.
Also if everybody would have listened to Patton there would have been no Eastern Block.
Then of course there was a little thing called D-Day which made the NAZI's have to take on the USA on two fronts all the while the USA was fighting on yet another Front in the Pacific.
The Ruskies did their part but not without the help of the USA committing to Two Fronts while the Ruskies had only one. :).