FWIW, also on their side, the common Russian belief is that THEY defeated Nazi Germany. Given that 80% of German casualties were on the Eastern Front, I suppose they have a point
Without the Soviets, the best the Brits and the Yanks would have fought the war to a stalemate.
Russia could not have defeated the Nazis in the East without the massive American Lend-lease enterprises, factories and armaments.