The Iran nuclear deal represents the most comprehensive international agreement ever reached in the area of nuclear nonproliferation. The confidence-building measures it elicits from Iran in order to ensure that its nuclear program will remain peaceful—ranging from intrusive inspections to novel verification mechanisms—are the most powerful of their kind that a Nuclear Nonproliferation member-state has agreed to. If the objective was to certify Iran’s compliance with NPT and block all possible paths toward a bomb, then this agreement represents the maximum that could have been achieved.
“Should Congress Approve the Iran Deal?” Hossein Mousavian, Foreign affairs, September 7, 2015.