Inventor of the "right of interference", Mario Bettati, a professor of International Law, explains in this book the precise political circumstances and the legal context under which the right of humanitarian interference came about. This book is divided into four parts which follow both a chronological and a logical order. Beginning with interference as verbal denunciation, following with interference as medical assistance, he speaks of forced interference (Yugoslavia, Somalia and Rwanda) and finishes by dissuasive interference (courts for crimes against humanity and conflicts observatories). A thorough presentation of an important subject.