“This book is a must-read for anyone seeking to curb atrocity crimes. Getting beyond endless debates about theory, the authors draw innovative lessons from a decade of international and national practice in implementing ‘the Responsibility to Protect.’ This was one of my chief priorities as Secretary-General, and Professor Luck, as my Special Adviser, was the architect of my three-pillar strategy for prevention and protection. I know that there is nothing easy about trying to protect populations and prevent atrocity crimes, but I also know from experience that it can and must be done. With vivid prose and the keen insight of practitioners, Professors Bellamy and Luck tell us how. Every official, advocate, humanitarian, analyst, scholar, and student should read this timely and masterly account. It points the way to a more secure and humane future.”H. E. Ban Ki-moon, Secretary-General of the United Nations, 2007‒2016“The deceptively simple goal of R2P – preventing mass atrocity crimes – belies huge complexity…Luckily there is a great new book out by Alex Bellamy and Edward Luck which, ambitiously, addresses all of these challenges…it is essential reading for anyone interested in the implementation of R2P.”Jess Gifkins, University of Manchester“This excellent book will, I am sure, become the defining work in our area.”Simon Adams, Executive Director of the Global Centre for the Responsibility to Protect, New York"impressive"International Affairs