It is impossible to give all credit of the entire World War 2 war to one country, because first of all D-day is considered by Most Historians the main turning point in the war, which was a joint effort. Secondly each country had a key role to play in order for victory as whole to be grasped. I seriously doubt one country all by themselves could get a win solo from beginning to end . Even Michael Jordan can't win a championship by himself. But if we are basing victory on who gave the most sweat from there brow it would be Russia. They suffered the most casualties 10,700,000 soldiers and 14 million civilians. Overall in retrospect there are many details Behind the Scenes which covers pass the scope of this question, which contributed greatly to the war effort from different countries of the Allies.
Josef Stalin was the leader of the Russians during WW2.
27,000,000 i think
Stalin led Russia in WW2.
Germany and Russia
Russia had no reasons, Switzerland was neutral.
Russia has been in numerous wars such as WW1 , WW2 , Afghanistan .
Russia is rich cuz in ww2 they owned the half of the oil production and industry.
Russia fears usa in ww2
The US won along with China, Great Britain, Canada, France and Russia were the main allies. The main Nazi's were Italy, Germany and Japan. They were on the losing sides.
The WW2 conflict between Germany and Russia .
Hitler's attack plan for Russia WW2
No, Before the German attack on Russia it was not in WW2.