IMO, President Medvedev was talking about Iran's getting close to having the technical expertise and knowledge necessary to construct a nuclear weapon. He was not stating that Iran was getting close to developing a nuclear weapon. He stated, "Iran is moving closer to possessing the potential which in principle could be used for the creation of nuclear weapons." If he meant to say that Iran was getting close to developing a nuclear device, he would have stated that Iran was getting close to creating nuclear weapons or something along those lines. Instead, he referred to "the potential which in principle could be used" to develop nuclear weapons. Nevertheless, one should not minimize the significance of what the Russian President was suggesting, because possession of the requisite knowledge/technical expertise is almost all of what is required to provide a country with a nuclear weapons capability.