Regional unions and coalitions are created in a situation where the formations of power in the international politics are brought about by some changes, the political and international orientation of the countries are transformed and new goals are created in the political, economic and security priorities of the countries. Under the new conditions that Iran has in its international isolation, having the capacity for the regional cooperation is indispensable. For the first time since the Islamic Revolution, Iran's participation and demand for membership in the Shanghai Organization as a security organization was a turning point in Iran's presence and participation in the multilateral security agreements and treaties, or more robust security alliances with the other blocs of global power;so regarding the specific circumstances of Iran's foreign policy and the America’s unilateralism, it puts a major positive psychological burden on Iran's interests. Therefore, due to the importance of the SCO for the national security of the Islamic Republic of Iran, thepresent research’smain questionwas whether Iran's admission as an observer-member of the SCO could increasenational security of the country from the point of view of regional cooperation. The initial and temporary answer to this question was that, due to the presence of the United States in its first security orbit, it aimed at creating homogeneous and targeted actions in the framework of regional cooperation to increase national security and balance its regional and international relations, so the Islamic Republic of Iranwas in need ofsome mechanisms like the Shanghai Cooperation Organization.
