While we were saving the russian bear’s miserable murderous skin in Europe, they were in China in alliance with Japan to destroy any vestige of democracy there.
The russians won on both fronts thanks to fdr and truman.
What I don't know, but speculate on, is what if the US had NOT done that
Remember that the Wehrmacht's back was broken in Stalingrad.
if the US had not supplied the USSR, what could have happened?
The German army was strong enough to take Moscow, but could they have handled the winters? they could have marched up to Siberia and down to Iran
But the Germans had one big problem -- they had very few allies in Eastern Europe as they slaughtered the Ukrainians and Belarussians. Yes, they had the Hungarians, Bulgarians, Croats and Romanians as nominal allies who were more concerned for their own patch of land, but there was a strong movement in Poland (agreed, it had no chance of throwing off the Germans at their top strength) and sooner or later the natives would rise up and overthrow the Germans