New International Order and Ideological-Security Strategy (Security Enigma) The Islamic Republic of Iran in the new millennium

The New International Order After the end of the Cold War and following it, the aggressive internationalism of the United States of America at the beginning of the new millennium (September 11, 2001) created tremendous changes in the international system. The foreign policy strategy of the Islamic Republic of Iran in the new millennium, in the shadow of the changes in the international system, is to become a regional hegemon and power. This research is of a fundamental type with a qualitative-interpretive method and inferring information through existing documents with a descriptive-analytical approach. Also, the collection of information and data has been done through a library. It seems that the new international order and the aggressive internationalism policy of the United States have influenced the foreign policy strategy of the Islamic Republic of Iran by the major developments of the international system and explained its efforts to become a potential regional power. The findings of the research show that regionalism, Shiaism, and militarism are not Iran's ideological-security strategies, but they can explain Iran's foreign policy strategy at certain times in order to become a regional power. Iran's efforts to increase its regional role are aimed at increasing the country's relative security and soft power. The purpose of this research is to investigate the impact of the macro changes of the international system on Iran's foreign policy strategy in the new millennium.