This book focuses on measures pertaining to the three-pillar implementation strategy of R2P and examines how and to what extent the three pillars have been practised. Rich in its geographical scope, this edited book provides a critical analysis of R2P practice over the last two decades by focusing on representative cases from different regions. Analysing not only recent and/or underexplored cases but also widely studied cases from a fresh and alternative perspective, it sheds light on the depth and scope of the norm as well as the variety of actors involved and how they impact R2P practice. Diverging from most accounts, this edited book does not approach the cases as a 'success' or 'failure' of R2P. By studying the background to the conflicts and making assessments on a pillar-by-pillar basis, each chapter addresses the root causes, traces the process of implementation, investigates the actions of the actors involved, identifies elements of success and failure and finally questions the sustainability of the protection provided to date. Meanwhile, the conceptual chapters complement the case analyses through an overall evaluation of R2P's first two decades and the progress achieved so far with the aim to draw lessons for future implementations of R2P.