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We know Stalin was willing to give quite huge concessions to Germany like a Brest Litovsk redux, and this was just when Barbarossa was starting.
Lets suppose Hitler has an accident or something at the absolute best of operation Barbarossa (I dont know if this was when the Germans were at the gates of Moscow and apparently there were like only 20,000 soviet troops to guard it or it was another point) and a saner leadership (possibly Goring) takes over and realize that an all out war against the Soviet Union is unwinnable and the best they can do is to capitalize on their victories to give them the greatest possibly advantadges against Britain.
What is the absolute best treaty Germany could get Stalin to sign? I was thinking something like Brest Litovsk but with greater territorial loss for the USSR and monthly oil tributes. But I dont know.
What is the best you can think about? What effects would it have in the west?