Armed non-state actors operate without state control and are involved in internal and trans-border conflicts. The activity of such groups in armed conflicts adds layers of complexity to traditional conflict management and resolution. These conflicts are often fought not only between non-state actors and states, but also between multiple NSA groups. Interventions in such conflicts is particularly challenging given the fact that international law and norms governing the use of force for intervention or peacekeeping purposes was primarily written in the context of the nation-state.