The book analyses the factors that shape each country’s fundamental energy interests in the region, how these interests impact their attitudes toward engaging the region on energy security and the way they carry out their regional engagement. Based on countries’ interests in promoting institutionalized regional energy cooperation and their capacity for forging that cooperation, the collection assesses each state’s role in contributing to an energy regime in Northeast Asia. It then concludes with a critique on the decade-plus quest for energy security cooperation in Northeast Asia and suggests ways forward for facilitating regional energy security cooperation. This book will be of great interest to scholars and students of environmental policy, energy policy, security studies, Asian studies and international relations.