The United States, Iran and five other world powers have announced an understanding outlining limits on Iran’s nuclear programme so it cannot lead to atomic weapons, directing negotiators toward achieving a comprehensive agreement within three months. The goal of the negotiations is an arrangement whereby Iran would need at least one year to produce enough fissile material — high enriched uranium or plutonium — for a single atomic weapon, should Tehran choose to produce one. That is known as the “break-out” time.
Iran & world powers reach nuclear accord
