This book examines a long-standing dispute regarding the prerequisite for the exercise of the right to self-defence and aims to offer a possible better alternatives for interpreting the significance of the precondition provided for in the Article 51 of the United Nations Charter, by taking a historical perspective on the development of that concept from the mid-19th century to 1945. The book defines the right of self-defence as understood in and before 1945, suggesting the typology which represents the strata of the concept. It will contribute to the current debate regarding the right of self-defence in contemporary international law, including that against terrorism, by providing a framework to analyse the state practice since 1945.

Determining the earliest point in time at which international law authorises a state to exercise its inherent right of self-defence is an issue which has been debated, but unsatisfactorily reasoned, by scholars and states since the 1960’s. Yet it remains arguably the most pressing question of law that faces the international community. This book unravels the legal and factual complications which have obscured the answer to this question. In contrast to most other works, it takes an historic approach by tracing the evolution of the rights, rules and principles of international law which have governed the use of force by states since the 16th century. Its emphasis on self-defence provides the reader with a new and complete understanding of how and why the international legal framework limits defensive force to repelling an imminent threat or use of offensive force which is directed at the territory of a state. Taking an historic approach enables this book to resurrect an understanding of the human defensive instinct which has guided the formation of the international law of self-defence. It also explains the true legal nature and scope of the inherent right of self-defence, of anticipatory self-defence and provides a definition of the legal commencement of an armed attack for the purpose of Article 51 of the Charter. Finally, the reader will receive a unique source of research materials and analysis of state practice and of scholarly works concerning self-defence and the use of force since the 16th century, which is suitable for all readers of international law around the world.

Self-defense and the right to go to war. Originally published: New York: Praeger, [1958]. xv, 294 pp. Bowett observes that the use or threat of force by any state can be a delict, an approved sanction, or a measure taken in self-defense. He examines the evolution of self-defense doctrine in the nineteenth and early-twentieth centuries, with the assumption of the existence of a state's unlimited 'right' to go to war. He then attempts to outline the limited and provisional effects of this right under the U.N. Charter. This book was written after Bowett's term as a United Nations legal officer from 1957-1959. "Throughout the work there is a refusal to dogmatize or to state in absolute terms any aspect of the 'privilege' of self-defence in its present context. (...) [Bowett] is to be congratulated on producing a timely and scholarly survey of one of the most fundamental, and often abused, sovereign rights known to international law." --K.R. Simmonds, British Year Book of International Law 34 (1958) 432. SIR DEREK WILLIAM BOWETT [1927-2009], an international lawyer, was President of Queens' College, Cambridge from 1969-1982 and Whewell Professor of International Law, Cambridge, from 1981-1991. He was awarded a CBE in 1983 and a knighthood in 1998. He is the author of The Law of International Institutions (1963), United Nations Forces: A Legal Study (1964), The Law of the Sea (1967), The Search for Peace (1972) and The International Court of Justice (1996).

In NATO Rules of Engagement, Camilla Guldahl Cooper offers clarity on a topic prone to confusion and misunderstanding. NATO rules of engagement (ROE) are of considerable political, strategic and operational importance, yet many of its concepts lack clarity. The resulting ambiguity may be detrimental for people involved and for mission accomplishment. Through a thorough analysis of the concept, purpose, development and use of NATO ROE, Cooper contributes to improved understanding and implementation of NATO ROE. The book covers all use of force categories and relevant law relating to the use of force during armed conflicts, including the complex concepts of hostile act and hostile intent, direct participation in hostilities, and the increasing reliance on self-defence during armed conflict.

While an abundance of literature covers the right of states to defend themselves against external aggression, this is the first book dedicated to the right to personal self-defense in international law. Dr. Hessbruegge sets out in careful detail the strict requirements that human rights impose on defensive force by law enforcement authorities, especially police killings in self-defense. The book also discusses the exceptional application of the right to personal self-defense in military-led operations, notably to contain violent civilians who do not directly participate in hostilities. The author establishes that international law gives individuals the right to forcibly resist human rights violations that pose a serious risk of significant and irreparable harm. At the same time, he calls into question prevailing state practice, which fails to recognize any collective right to organized armed resistance even when it constitutes the last resort to defend against genocide or other mass atrocities.

States invariably justify using force extraterritorially by reference to their right of self-defence. In doing so, they accept that the exercise of this right is conditioned by the customary international law requirements of necessity and proportionality. However, these requirements are notorious for being normatively indeterminate and operationally complex. As a breach of either requirement renders ostensibly defensive action unlawful, increased determinacy regarding their scope and substance is crucial to how international law constrains military force. This book examines the conceptual meaning, content, and practical application of necessity and proportionality as they relate to the right of self-defence following the adoption of the UN Charter in 1945. It provides a coherent and up-to-date description of the applicable contemporary international law and proposes an analytical framework to guide its operation and appraisal. This book argues that necessity and proportionality are conceptually distinct and must be applied in the foregoing order to avoid an insufficient 'catch-all' description of legality or illegality. Necessity determines whether defensive force may be used to respond to an armed attack and where it must be directed. Proportionality governs how much total force is permissible and prohibits excessive responses. Both requirements are shown to apply on an ongoing basis throughout the duration of an armed conflict prompted by self-defence. Compliance with necessity and proportionality ensures that the purposes of self-defence are met, and nothing more, and that defensive force is not unduly disruptive to third party interests and to international peace and security.

Provides a multi-perspective study of the international law on self-defence against non-State actors.