This casebook on international law and the use of force brings together cases and materials on the regulation of resort to armed force and the conduct of armed conflict. It covers such pressing global issues as the Russia-Ukraine conflict, maritime disputes in the South China Sea, and civilian protection in warfare. The new edition adds important new reports by United Nations Special Rapporteurs, the Council of Europe, and the International Committee of the Red Cross. It also includes new cases from the European Court of Human Rights and other courts and tribunals. The final chapter on weapons has been revised to expand coverage of new developments.