There is no doubt that with the normalization of relations between Iran and Saudi Arabia after a long period of tension, one of the most key results of this agreement, that is, its impact on the security relations between Iran and the Arab world, and at the center of it, Iran and the Persian Gulf, is of particular importance. will be. Yemen, Lebanon, Syria and Iraq, during the past years, have always been the scene of indirect confrontation between these two regional powers. But the question is, what is the reason for these tensions? What effect has the agreement between Iran and Saudi Arabia had on the continuation of this cold war, and more importantly, what effect will this informal understanding have on the economic, political and security-military dimensions of Iran and other Persian Gulf countries? Some believe that the tensions between the two countries are caused by the endangerment of the oil-economic interests of these countries, some believe that this fear is caused by the possible increase of Iran's influence in the region, and in the opinion of others, the Arabs are worried about America's tendency towards Iran and perhaps attention less the United States to them. But perhaps these reactions can be explained in the form of defensive realism and according to "Taliaferro" one of its four main assumptions, i.e., the "security enigma", by means of which, every action of a government to increase its security, on the part of governments The competitor is considered as a hostile action. The following article tries to answer this question by assuming that the agreement between Iran and Saudi Arabia, as a factor that caused the security puzzle in the relations between the Arab world and Iran, both before and after it was achieved.