Written by a team of international lawyers from Europe, Asia, Africa, and the Caribbean,this book analyses some of the most significant aspects of the ongoing armed conflictbetween the Russian Federation and Ukraine. As challenging as this conflict is for the international legal order, it also offers lessonsto be learned by the States concerned, and by other States alike. The book analysesthe application of international law in this conflict, and suggests ways for this law'sprogressive development. It will be useful to practitioners of international law working at national Ministriesof Defence, Justice, and Foreign Affairs, as well as in Parliaments, to lawyers ofinternational organizations, and to national and international judges dealing withmatters of public international law, international humanitarian law and criminal law.It will also be of interest to scholars and students of international law, and to historiansof international relations. Sergey Sayapin is Assistant Professor in International and Criminal Law at the Schoolof Law of the KIMEP University in Almaty, Kazakhstan. Evhen Tsybulenko is Professor of Law at the Department of Law of the Tallinn Universityof Technology in Tallinn, Estonia.