it is interesting to note that at no point during the war both sides fought simultaneously against the other side. E.g., the USSR was on Germany's side during

it is interesting to note that at no point during the war both sides fought simultaneously against the other side. E.g., the USSR was on Germany's side during the battle of Britain (supplying fuel for german bombers). The Japan non-aggression pact was kept until after the defeat of Germany. The many European countries that fought on both sides along the course of the war, etc.