"Collective self-defence involves the use of military force to aid a state that is the innocent victim of aggression. However, it has often been abusively invoked as a pretext and risks escalating conflicts. Green analyses fundamental questions about the conceptual nature of collective self-defence and its legal requirements"--

James A. Green is the author of The Persistent Objector Rule in International Law (2016), which won the ESIL Book Prize, and The International Court of Justice and Self-Defence in International Law (2010), which won ASIL's Lieber Prize. He is the Co-Editor-in-Chief of the Journal on the Use of Force and International Law and co-rapporteur of the ILA's Use of Force Committee.

Introduction; 1. Delineating collective self-defence; 2. The history and development of collective Self-defence; 3. The requirements shared by individual and collective self-defence; 4. The purported declaration and request requirements for collective self-defence; 5. The issuer of a collective self-defence request; 6. The manner and form of a collective self-defence request; 7. Collective self-defence treaty arrangements; 8. The relationship between collective self-defence and military assistance on request; Conclusion; Bibliography.