With its unstable and intermittent nuclear weapon project, and the recent leadership succession issue, Democratic People’s Republic of Korea (DPRK) has been a source of insecurity for the past decade in this region, in addition to the delicate international relations among the powerful China, United States, Japan, and Russia. The essence of DPRK issue lies in the instability and uncertainty of nuclear development that even the slightest miscalculation by any one power could disturb the sensitive balance of relationships, creating a butterfly effect with a catastrophic result. Drawing on various perspectives on the interaction over DPRK and other regional powers, this volume seeks to explore the role of DPRK in Northeast Asia, and its implication to regional security as a whole. The volume does not confirm a particular position over DPRK’s nuclear showdown; rather it invites scholars to provide assessments from the viewpoints of neighbouring powers in order to present a more complete understanding of the leading issue in Northeast Asia. The volume will serve as an invaluable resource for policymakers, students and scholars of North Korean politics and international relations. This book was published as a special issue of the Journal of Comparative Asian Development.