The purpose of this study is to analyze the causes of the Yemen crisis by focusing on the national interests governing the relations between Iran, Saudi Arabia, and the United States. If the cooperation or non-cooperation of actors over national interests does not lead to conflict, the national interests are parallel. If there are conflicts between them to achieve the national interest, they have conflicts of interest. If they cooperate in achieving national interests, they have a common national interest. And if the intensity of the conflict between actors is less profound than the conflicting national interest and they seek areas of influence for themselves, their national interests are of a discordant kind. Accordingly, the research raises the question of the causes of the Yemen crisis by focusing on the conflicting, parallel, common and discordant national interests of Iran, Saudi Arabia, and the United States in the 21st-century Yemen crisis in the Middle East? By collecting documentary information and explanatory research methodology, Firstly, it sees the cause of the crisis in the common national interests of Saudi Arabia and the United States and sees al-Qaeda's security, energy, and counterterrorism as the triangle of the Yemen crisis, a handicap for the cause The second cause of the crisis is the discordant national interests of Iran and Saudi Arabia and considers the confrontation of The Discourse of Iranian Shia Islam and the Saudi Salafi Islamic discourse in the Yemen crisis as also disabled for the cause. And the last cause of the Yemen crisis is Iran's conflicting national interests with the United States, and its effect is to deter Iran from infiltrating the 21st-century Middle East Yemen crisis.
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