Iran's defense minister on Thursday vowed that his country would "use nuclear defense as a potential" if "threatened by any power."Speaking following a meeting with his Syrian counterpart Hassan Ali Turkmani in Teheran on Thursday, Iranian Defense Minister Mostafa Mohammad Najjar emphasized that Iran "should be ready for confronting all kinds of threats."Teheran has denied accusations by the US and its allies that Iran was seeking uranium enrichment technologies in order to develop nuclear weapons, saying its program was only meant to generate electricity. Meanwhile, Turkmani told reporters that Syria and Iran's "policy is the policy of strengthening resistance and tackling the threats of United States and Israel."He added that he wouldn't give details of joint defense plans against Israel, although the plans were "not secret."Answering a question regarding a newly-developed Shahab 4 missile, Najjar said that research activities were underway. Iran would continue production of "different missiles and research," Najjar declared.The most recent Iranian missile was the Shahab 3, and Iran recently claimed to have followed it up with the development of the Shahab 4.