Consequences of the vacuum in the presence of the United States of America in West Asia on the foreign policy of the Islamic Republic of Iran and Saudi Arabia: a pattern of constructive cooperation or destructive competition.

The change in the strategic priorities of the United States and the change in the geopolitical direction of Washington towards the Asia-Pacific with the aim of containing China, has caused a decrease in the importance and, as a result, a decrease in the presence of the United States in the Middle East and North Africa region. This transformation has prepared the space for the Role-Playing of other great powers, including Russia and China, and after that, it has influenced the regional politics of the Islamic Republic of Iran and Saudi Arabia as two competing regional powers. In response to these new conditions, Riyadh has adopted a strategy of diversifying its security partners (and at the same time, trying to obtain security guarantees from the United States), and in this regard, even an option such as normalizing Saudi relations with the Zionist regime has placed on the table. On the other hand, Iran, whose regional policy has always been defined around the axis of resistance to the foreign presence (especially the United States) in the region, now faces a strategic contradiction, because this time, Russia and China are Iran's allieswho seek to increase their influence in the Middle East region.In such an environment, the factor of the simultaneous desire of the United States of America, China, and other extra-regional powers in the region to create a balance between Tehran and Riyadh, and at the same time, the factor of the desire of both sides (Iran and Saudi(to manage another threat, while avoiding not to accept each other's dominant role, are the factors that can lead to optimism regarding the formation of controlled competition between Iran and Saudi Arabia