People need to research World War 2. The Russians/Soviets took on the full fury of Germany and fought them for over 2 years whilst France fled, British stayed in Britain & The USA stayed in the Pacific.
Russia took out German, Yes The Allies did help, but you all seem to forget that 10's of millions of Russians died before the Normandy invasion by the Allies.
And , Japan only surrendered after Russia / Soviets invaded Manchuria.
& Dont forget, Most of the Nazi scientist , Gestapo & other Political figures end up in the USA & Europe after Operation Paperclip.

Time that you learnt your History