The nuclear agreement with Iran is an extraordinary feat of diplomacy.
First and foremost, non-proliferation experts agree that the deal blocks all of the routes to making an atomic bomb. There are provisions for rigorous inspections—so if Iran cheats, the world will know.
Second, it isn’t just Washington to whom the Iranians are accountable. All five permanent members of the UN Security Council, and Germany too, signed alongside the United States. The UN’s nuclear watchdog, the International Atomic Energy Agency, will monitor Iranian activities on the great powers’ behalf.