Iran has had a nuclear programme since 1959 when the United States gave a small reactor to Tehran University as part of the “Atoms for Peace” programme during Mohammad Reza Shah Pahlavi’s reign. When the Non-Proliferation Treaty (NPT) was introduced in 1968 and entered into force in 1970, Iran was one of the first signatories of that Treaty.
Newly published recollections by the former French ambassador to Iran suggest that Iran was not running a covert nuclear weapons programme that it then decided to halt in late 2003, as concluded by U.S. intelligence in 2007.