This comprehensive volume is the first systematic effort to explore the ways in which recognised states and international organisations interact with secessionist 'de facto states', while maintaining the position that they are not regarded as independent sovereign actors in the international system. It is generally accepted by policy makers and scholars that some interaction with de facto states is vital, if only to promote a resolution of the underlying conflict that led to their decision to break away, and yet this policy of 'engagement without recognition' is not without complications and controversy. This book analyses the range of issues and problems that such interaction inevitably raises. The authors highlight fundamental questions of sovereignty, conflict management and resolution, settlement processes, foreign policy and statehood. This book will be of interest to policy makers, students and researchers of international relations. It was originally published as a special issue of the journal Ethnopolitics.