The role of non-state actor in contemporary world politics is increasingly important. After 9/11, scholars of security study and security practitioners begin to concern about the non-state actors which usually called as terrorist group or terrorist organization. The use of violence by those actors makes them can be classified as Violent Non-state Actor (VNSA). It cannot be denied that VNSAs activity can affect the state security policy and provoke state to war against them. Therefore, this paper will examine Jabhat al-Nusra—as an actor with tied to Al-Qaeda—involvement in the Syrian armed conflict, as a phenomenon that illustrates the role and influence of VNSA in affecting state behavior. This paper will try to show any factors that allow ...