This thesis seeks to analyze whether, and how, parallel legal tools can contribute to increasing non-state armed groups (NSAGs) compliance with international humanitarian law (IHL). The initial parts of this study highlight how the changing nature of warfare has brought forth a number of challenges to the framework of IHL. It is argued that while the international laws guiding conduct in war remains state-centered, the practical reality is less and less centered on the state. In following, it puts forth that enhancing NSAGs compliance with IHL is viewed as one of the core challenges to strengthen protection of civilians in armed conflict. It is suggested that the mechanisms for implementing IHL have failed to keep up with the changing natur...