The structure of International system and Turkish politics against ISIS

The purpose of this paper is to examine the change in Turkish strategy against ISIS from "support" to "battling". In order to understand is used the approach of the "structure of the international system," which is a synthesis of "regional hegemonic structure" and "trans-regional repulse structure" to indicate why Turkey is carried out to the "big change".For this purpose, is used descriptive-analytical method and relied on documentary sources through library research. The findings show because of the limitations of the regional structure due to superiority of Kurds, the axis of resistance and Russia as the dominant forces on the one hand and Trans-regional systemic pressures due to discredit front of the US, EU and international institutions / world public opinion, on the other hand, turkey was forced to strategic turn in its policy against ISIS. So, this kind of revisionism comes from a tradition based on realistic in order to restore power and national security not from the revolutionary tradition based on real determination to fight terrorism.