Comparative study of Islamic Republic of Iran and EU's foreign policy on ISIS crisis from the point of view of Defensive Realism

The post-age period means going beyond ISIS and a period in which ISIS and ISIS's existence are not existential and somewhat ambitious. Its postmodern age will be an era in which frictions are more compact and open space becomes much more direct. In other words, ISIS has now failed in Syria, and as it moves away, there will be renewed issues and revival of disputed issues between the Syrian oppositionists and Assad. The Syrian crisis has affected Iran and has created challenges in relations between the two countries. The approaches followed by Iran in recent years in the field of foreign policy are rooted in the historical issues and the behavior of policymakers and the motives of the two countries. On the other hand, the European Union, which somehow had a French influence in Syria and now has economic and ... relations with this country, although dissatisfied with the existence of the central government of Damascus under the leadership of the Assad dynasty, It seeks to create a strong security blockade against the influence of the terrorist elements of the Middle East. In this article, we are trying to answer the following question: what are the foreign policies of the regional power of Iran and the transatlantic power of the European Union in relation to Syria? What are their goals? What are the consequences of these goals and the route to them?