Which is the root of the Catch-22. The Nazis have no means to keep the British from entering a war with them and staying there, and they have no means of delivering a German victory over the USSR. Thus the Nazis are precisely that unenviable combination of too menacing to consider negotiations with and too feckless to actually win.
Yeah. Which means a perfect hell of a total war before they're done, but a pretty inevitable outcome, at the same time.
So long as the Allies will keep fighting, the Nazis are unable to do anything about it. But - and I'm not sure how you would do this when they're regarded as monsters and liars - theoretically that will could fade.