This Oxford Handbook provides an authoritative and comprehensive analysis of one of the most controversial areas of international law. Over seventy contributors assess the current state of the international law prohibiting the use of force, assessing its development and analysing the many recent controversies that have arisen in this field.

Written by a team of distinguished and internationally renowned experts, this Oxford Handbook gives an analytical overview of international law as it applies in armed conflicts. The Handbook draws on international humanitarian law, human rights law, and the law of neutrality to provide a comprehensive picture of the status of law in war.

This book explores the whole of the large and controversial subject of the use of force in international law; it examines not only the use of force by states but also the role of the UN in peacekeeping and enforcement action, and the growing importance of regional organizations in the maintenance of international peace and security. Since the publication of the second edition of International Law and the Use of Force the law in this area has continued to undergo a fundamental reappraisal. Operation Enduring Freedom carries on against Al Qaida and the Taliban in Afghanistan six years after the terrorist attacks of 11 September 2001. Can this still be justified as self-defence in the 'war on terror'? Is there now a wide right of pre-emptive self-defence against armed attacks by non-state actors? The 2006 Israel/Lebanon conflict and the recent intervention of Ethiopia in Somalia raise questions about whether the 'war on terror' has brought major changes in the law on self-defence and on regime change. The 2003 invasion of Iraq gave rise to serious divisions between states as to the legality of this use of force and to talk of a crisis of collective security for the UN. In response the UN initiated major reports on the future of the Charter system; these rejected amendment of the Charter provisions on the use of force. They also rejected any right of pre-emptive self-defence. They advocated a 'responsibility to protect' in cases of genocide or massive violations of human rights; the events in Darfur show the practical difficulties with the implementation of such a duty.

The international law on the use of force is one of the oldest branches of international law. It is an area twinned with the emergence of international law as a concept in itself, and which sees law and politics collide. The number of armed conflicts is equal only to the number of methodological approaches used to describe them. Many violent encounters are well known. The Kosovo Crisis in 1999 and the US-led invasion of Iraq in 2003 spring easily to the minds of most scholars and academics, and gain extensive coverage in this text. Other conflicts, including the Belgian operation in Stanleyville, and the Ethiopian Intervention in Somalia, are often overlooked to our peril. Ruys and Corten's expert-written text compares over sixty different instances of the use of cross border force since the adoption of the UN Charter in 1945, from all out warfare to hostile encounters between individual units, targeted killings, and hostage rescue operations, to ask a complex question. How much authority does the power of precedent really have in the law of the use of force?

On a global scale, the central tool for responding to complex security challenges is public international law. This handbook provides a comprehensive and systematic overview of the relationship between international law and global security.

This book is a contemporary, comprehensive, and accessible text on the use of force and international law suitable for a range of audiences.

1. Law and Force; 2. The Prohibition of the Use of Force; 3. Invitation and Intervention: Civil Wars and the Use of Force; 4. Self-defence; 5. Collective Self-defence; 6. The Use of Force against Terrorism: a New War for a New Century; 7. The UN and the Use of Force; 8.