This book examines the development of collective security by regional organizations particularly after the Cold War. It analyzes the various constitutional developments that have occurred within regional arrangements such as ECOWAS, African Union, SADC, OAS, and NATO, and critically analyzes how these developments have propelled regional organizations to depart from the normative framework of regional arrangement contained in Chapter VIII of the UN Charter. Through a comprehensive examination of practice, the book evaluates the impact of regional organizations' newly asserted powers to...