We may very well have had to fight in Japan twice.
Had we invaded, the Soviets would have also joined the fight, and thus, Japan would most likely have been divided, like Korea and Germany. And of course, the Communists would have gone for the whole thing in a civil war, just like in Korea.
Not really...The Soviets while having a massive land army and tactical air ..had no Navy of note, no amphibious force and no sea lift... making it very hard to invade an island nation....
The Soviets WW2 forces were very similar to in composition to the German forces a massive land army and tactical air... and would have the same problems the German had with getting at Britain in 1940 across the channel...
Conversely the US in fighting two very different wars had to develop a very balances composition of not only a land army and tactical air ...
Bottom line that massive land army of the Soviets was not going any were that required heavy sea lift to get there and supply them once they got there
... Rock, Paper, Scissors ...