This work investigates the legal framework governing non-international armed conflicts (NIACs) and the challenges of applying international humanitarian law to internal hostilities. Sandesh Sivakumaran, a professor of international law, synthesizes treaty law, customary international law, and judicial practice to clarify the rules applicable to non-state actors and state forces. The text provides a comprehensive analysis of how legal standards evolve when applied to conflicts that do not cross international borders.

Legal scholars and practitioners frequently cite this text as a definitive reference for understanding the complexities of internal armed conflict. Experts highlight the rigorous academic depth and the systematic approach the author takes in navigating ambiguous areas of international law.