Tovarich
Banned
I think that, in the unlikely but not impossible event that the US UK decide to send supplies to the USSR thanks to simple realpolitik, it would still be quite fairly different from OTL. Any supplies the Soviets get would likely be measured out to be just barely enough to keep the USSR in the war against Germany, and probably come with a lot of strings attached. It seems entirely possible that the West might charge more for supplies than Stalin is willing to pay.
You don't think they would still prefer soviet soldiers being fed into the death-mill rather than their own?
Remember, the declaration of war onto the USSR (not even signed by the USA IITL, just the UK) is imply a piece of paper, easily ripped-up and forgotten.
In a 'Total-War', truth and history is what the propoganda departments say it is.