Let's posit a scenario like the one in this TL I wrote two years ago. The TL;DR version is that Case Blue is highly successful because Hitler doesn't divert the Fourth Panzer Army to the Don Crossing, which results in the fall of Stalingrad in summer 1942. Stalin subsequently wastes men and materiel in useless offensives to retake the city bearing his name and quits the war in March 1943 IIRC. The TL continues with the Western Allies (Britain and the US) continuing the war and choosing a peripheral strategy and, starting in the summer of 1945 nuking German cities and Stalin eventually rejoining the war. This results in VE Day in 1946 after a much more difficult European War.
The Allies would know in advance how hard and bloody a war without the Soviets in the war would be as dozens of divisions would be freed up for other fronts while a lot of the Luftwaffe would be freed up to deal with the bombing campaign against German cities. There will be voices in favour of ending the war because it'll be too damn bloody. The question of this thread: how likely is it that the British and US agreed to some kind of negotiated peace if the Soviets quit the war in late 1942/early '43?
The Allies would know in advance how hard and bloody a war without the Soviets in the war would be as dozens of divisions would be freed up for other fronts while a lot of the Luftwaffe would be freed up to deal with the bombing campaign against German cities. There will be voices in favour of ending the war because it'll be too damn bloody. The question of this thread: how likely is it that the British and US agreed to some kind of negotiated peace if the Soviets quit the war in late 1942/early '43?