After more than 10 months of diplomatic pause, the United States and Iran appear to be on the verge of an agreement that encompasses both the nuclear issue and a prisoner swap. It is not a formal agreement, but rather an unwritten, informal understanding that focuses only on halting the escalatory cycle between the U.S. and Iran. What has prompted Washington and Tehran to return to diplomacy? If a written agreement embodied in a U.N. Security Council Resolution could not hold, what can an unwritten understanding achieve? Can it pave the way for a broader resolution of the nuclear crisis?
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