Iran had shipped nearly its entire fissionable stockpile, over 12 tons of enriched uranium, to Russia last month. Iran mothballed thousands of centrifuges necessary to enrich uranium for an atomic bomb. And Iran removed the core of its heavy water reactor at Arak, and filled it with concrete. That reactor could have produced plutonium for the other type of atomic bomb.

Forbes: As World Powers Push To Implement Iran Nuclear Deal - Who Needs America?