ww2:What if Russia, Germany, and the Japanese had declared to England, French, and America instead who would win?

Futility would win and sellers of hindsight mirrors.

What does this question even mean?

Given that Germany invaded Russia (aka the USSR), why exactly would Russia be declaring war on England, France & America?? If someone was attacking my country, killing my people & destroying my cities, I don't know why I would be declaring war on someone that had nothing to do with this. Why would they do this exactly??

No offense but this question is completely pointless. The reason why as this "what if" question is not even a what if. It was never possible to begin with. Germans and Russians hated each other long before WW2 even started. The fact that both Stalin and Hitler saw each others governments as a great "evil" amonsts the world. Duing the war Hitler had communists and other political rivals sent to concentration camps. Stalin had all non-communists sent to gulags or were purged.

The fact that Fascism and Communism are to radically opposing ideologies alone prevented any sort of cooperations or alliance. Prior to world war 2, Hitler stated in private that he would of wished for the British to allied with Germany to help rid the world of the communist threat that is the USSR.

the allies would still have won the war because of the atom bomb.

Nobody. It would have been a stalemate. France would have been conquered but the US and UK would have been able to hold out against all of them, but they wouldn't have had much of a shot at beating them all. It would have been possible to still beat Japan but this is just because the Soviet Union and Germany wouldn't have been able to do much to aid them in the Pacific.