or jus in bello, this body of fundamental principles and customary and treaty rules aimed at regulating armed conflicts is a key part of public international law. The collection is organized in four sections, covering respectively ‘Selected materials on general legal issues’ (Section I), ‘Selected main international humanitarian law treaties and customary rules’ (Section II), ‘Selected treaties on weapons and disarmament’ (Section III), and ‘International responsibility for war crimes and other internationally recognized crimes’ (Section IV).