The full implementation of the Joint Comprehensive Plan of Action (JCPOA) struck by Iran and six world powers July 14 will have a great impact on Iran-US relations. It will diminish the existing mutual sense of threat between the two countries, and that change will be reflected in regional policies. The idea of collective action to solve regional issues will be strengthened and an era of multilateralism will consequentially emerge in the region.
The JCPOA has primarily served to solve a strategic discrepancy between Iran and the United States. Since Washington is the most significant extra-regional actor in the region, the deal will greatly affect regional political-security equations, especially regarding the future role and participation of Iran.