The controversy over the Iranian nuclear program is in many ways a product of the US-Iranian conflict. The United States and Iran are in the grip of mutual negative perceptions that, in turn, have been reinforced by the escalatory dynamics of the nuclear dispute. After years of seeming diplomatic deadlock, these dynamics suddenly changed for the better in the autumn of 2013. The positive trends culminated in November, when Iran agreed with the five permanent UN Security Council members and Germany, the so-called P5+1, on a confidence-building deal known as the Joint Plan of Action (JPA). Given the record of diplomatic non-achievement, the deal is a historic development.