This book explores non-traditional, 'critical' security issues in Northeast Asia. This exploration adopts an approach to critical security that emphasizes the play of identity and culture in the apprehension of insecurity understood primarily in existential terms. The study thus focuses upon the apprehension of insecurity derived from demographic pressures, resource limitations, ecological degradation, food politics, identificatory challenges, health threats, and political change. The study seeks to assess existing approaches to such threats and to propose alternatives that stress the importance of transnational co-operation as the principal means of tackling the complexity of contemporary societal insecurities in Northeast Asia.