After the dissolution of the Soviet Union, the US has always played the most important and influential role in the Iran-Russia relations. From the second half of the 1990s, one of the US foreign policy priorities has constantly been on the separation and divergence in the Iran-Russia relations, for which the US spared no efforts. Since the synergy of powers between the two countries and their anti-unipolar policies have always been a serious threat to the US hegemony at a global level, by the beginning of the Syria crisis in late 2010, following the Arab Spring, the US interests and goals were directly at odds with Iran’s and Russia’s political and security interests. The goals of Washington in the Syria crisis included: the decline of the Syrian government, the overthrow of Bashar al-Assad, and an effort to establish a pro-Western government to eliminate the sole ally of Russia after the dissolution of the Soviet Union, and also to prevent Iran’s regional penetration, particularly its proxy groups like Hezbollah. For achieving these goals, Washington has profited from its allied countries in the region, such as Saudi Arabia, Qatar, and Turkey, as a front line. The US strategy in Syria not only exacerbated the crisis but also provided a situation in which Iran and Russia achieved their highest level of military and security cooperation in the past three decades. And it was precisely the same incident that the US considered a serious threat to its national interests and policies. Although Iran and Russia have pursued specific and sometimes contradictory interests, in the end, focusing on common goals and threats – arising from the Syrian crisis – they were able to cooperate effectively and take a new step in building a strategic unity.
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