LINK TO REPORT The April 2020 U.S. State Department Compliance Report, Adherence to and Compliance with Arms Control, Nonproliferation, and Disarmament Agreements and Commitments, states that Iran has “progressively expanded its uranium enrichment activities and stockpile of enriched uranium, key factors in determining the amount of time required to produce enough fissile material for a nuclear weapon or device, should Iran decide to pursue nuclear weapons.” This time period is often referred to as the time needed to produce enough weapon-grade uranium for a nuclear weapon, or as breakout time. In line with previous conventions used by the Institute, 25 kilograms of WGU represents an amount sufficient for a single nuclear weapon.