In his article on the Iranian nuclear program, Barry R. Posen pointed out that Iran's nuclear program could cause regional and global instability. Regionally, Iran's neighbors will feel threatened by Iranian nuclear energy. This situation could lead them to follow Iran's lead in developing nuclear weapons even if they lack the capacity to ensure the security of their nuclear sites. Clearly, the proliferation of nuclear weapons will place the Middle East in an increasingly dangerous situation. Globally, the United States and its allies fear that the situation in the Middle East could harm their national interests. The Middle East is still a major producer of oil, the main energy resource for industrialized countries. Conflicts in the Middle East likely affect economic growth in the United States. Based on this situation, the ruling party in the United States tends to take a decisive approach to ensure that its national interest remains secure. They will analyze all the possibilities and usually make predictions based on the nature of the realism perspective. Therefore, many assumptions may ignore the possibility of goodwill from other countries. The key point in Posen's document is the failure of the United States to negotiate with Iran to stop its nuclear program. The next step the United States should take is to ensure its own security. Posen also highlighted the additional risks that Iran's nuclear program poses to the United States and analyzed all risks based on the recent situation. Many of Posen's concerns involve the fact that nuclear weapons could be used by non-state actors such as terrorists and the possibility that Iran is inclined to use nuclear weapons to threaten Israel or neighboring countries. However, Posen also provides an exposition...... middle of paper ......). The global war on terrorism: the most extensive. Pointer, Journal of The Singapore Armed Forces, 15-23.Milton, V. (1998, 13 April). Ayatullah Ruhollah Khomeini.TIME. Retrieved from http://content.time.com/time/magazine/article/0,9171,988165,00.htmlPosen, B. R. (2001). A nuclear-armed Iran: a difficult but not impossible political problem. Essential Reading in World Politics, 4a, Shadmer, M. (2011). Ideology and the Iranian revolution. Manuscript submitted for publication, Department of Economics, University of Miami, University of Miami, Miami, . Retrieved from http://moya.bus.miami.edu/~mshadmehr/Ideology.pdfS. Hashimi, A. (2008). Iranian synthesis of ideology and pragmatism: Its role in regional politics. Focus on Regional Issues, XXVI(1), Sherill, C.W. (2012). Why Iran wants the bomb and what. Nonproliferation Review, Vol. 19, no. 1, March 2012 , 32-49.