I didn't think anyone would actually give a shit about it...
I wrote it ages ago. I was like 14. I hadn't world built enough to tell you much of anything.
Also I actually called it World War 2 1/2 in-verse. The thing is that 1) Hitler didn't commit suicide, and 2) Hiroshima and Nagasaki were bombed, but it didn't end the Pacific side. I still didn't get very far with the whole world building thing, like I said. And I've lost all motivation really to try to get back to it.
It was ten years ago and I was mostly fiddle-farting with the idea of okay, Hitler is still alive and yada yada. I don't know why you expect me to go into detail. I barely remember what I was even trying to do with it.
I don't have the manuscript on this computer either so I can't really check.
As for the actual question, the Soviets were Allies. A lot of different things went down when WW2 went into a 'lull' as it were.
Basically: world building, or lack thereof, is why I can't answer the questions wanted and I'm sorry.
Also as for nuclear war all I have to say is Fallout. And before anyone says anything it's AU where nuclear fallout is concerned amongst other things. And I recognize that.