"Britain does not have the right to question others when they're not complying with their obligations" referring to the obligation by the U.K., United States, Russia and France to disarm under the NPT accord and "It is very unfortunate that the UK, which is always calling for non-proliferation not only has not given up the weapons but has taken a serious step toward further development of nuclear weapons," Iran's envoy to the International Atomic Energy Agency, told a conference examining the Trident decision.