The negotiations which restart today are the latest round of a 10-year effort by the international community to satisfy itself that Iran is not embarked on a nuclear weapons programme. This initiative was begun in 2003 by me and the then foreign ministers of France and Germany, Dominic de Villepin and Joschka Fischer, when it became clear that Iran had failed to disclose much of its activities to the IAEA, in breach of the Non-Proliferation Treaty (NPT) to which it adheres. I visited Tehran five times as foreign secretary. The Iranians are tough negotiators, more difficult to deal with because of the opacity of their governmental system. (When I complained to Kamal Kharrazi, the Iranian foreign minister, about this, he replied: “Don’t complain to me about negotiating with the Iranian government, Jack. Imagine what it’s like negotiating within the Iranian government”). They have not helped themselves by their obduracy.