CanadianGoose, in all honesty I don't know what you're talking about or what you've been reading as I made no comments about the British(or Americans) fighting the Soviets.
If, after four years of war, the British lose hundreds of thousands of men in a failed invasion attempt, with attendant air, naval and economic losses then Churchill is finished. As it was, in OTL, the British were dissolving units every month once D-Day was complete as they had run out of manpower. Now add a catastrophe involving more British dead or captured than in the entire war and it is hard to imagine the British continuing as an effective player in the war.
The US could stay in the war if you can explain how the US does so without any bases on British territory. Perhaps in French North Africa but I doubt it. Egypt had been developed for years to supply a substantial force but the French colonies had not.
And once Stalin realizes that, at best, his last ally is going to be on vacation for a few years building up logistics and supply lines I doubt he has much hope of continuing. I'm not going to go off on fantasies like the US invading Norway successfully from Halifax and Boston or Stalin permitting large forces of Americans on Soviet territory.
In this situation the only chance for the Allies to win is a merciless American nuclear bombardment.
