Ever since a defector exposed the existence of Iran’s nuclear program in 2002, the regime in Tehran has routinely protested its innocence in the face of charges that it is developing fissile weapons of mass destruction and the missiles on which to carry them. Its nuclear program, Tehran claims, has only civilian purposes, and it is allowed to pursue such a program under the terms of the binding international treaties to which it is a signatory.
http://www.commentarymagazine.com/viewarticle.cfm/the-iranian-shell-game-11460