This second edition of Ingrid Detter's authoritative work explores the changing legal context of modern warfare in the light of events over the last decade, especially in Kosovo, East Timor, and Rwanda. Detter reviews the status of international forces and the role and responsibilities of organisations including the United Nations, the European Union, and the Red Cross. This new edition covers the Comprehensive Nuclear Test Ban Treaty (CNTBT), the Landmine Convention (1987), and Laser Protocol. It considers the aftermath of NATO's military action against the former Yugoslavia and its humanitarian justification, an action which illustrates the diminished 'reserved domain' over which a State has exclusive rights. New topics include compensation for war crimes, information warfare, space weapons, war crimes tribunals, sanctions and interventions. This updated edition will be of use to students of international law, international relations and politics.