The Battle of the Bulge is over...so FDR negotiates with Hitler to sue for peace. The Nazis are still in full control of Germany, but we want to end the war....with promises from them to stop fighting outside of Germany, and to close the Concentration camps....and stop their aggression. With no evidence they'll keep their word....we agree.
This is how I see our current peace treaty with Iran. Their Nazi-like regime....is still in power, they have no defence....but we're backing off....for the sake of economics. The Iranian people under horrible oppression.... be d*mned.
The world still at risk from the fanatics....& nuclear holocaust....still in place.