Defining and conceptualizing Northeast Asia's security complex poses unique quandaries. The security architecture in Northeast Asia to date has been predominately U.S.-dominated bilateral alliances, weak institutional structures and the current Six Party Talks dealing with the North Korean nuclear issue. There has been a distinct lack of desire among regional countries as well as the U.S. to follow in the footsteps of Europe with its robust set of multilateral institutions. However, since the late 1990s, there has been burgeoning interest among regional states towards forming new multilateral institutions as well as reforming and revitalizing existing mechanisms. Much of this effort has been in the economic and political arenas, with the creation of bodies such as the East Asian Summit, but there have also been important initiatives in the security sphere. This book offers detailed examinations about how this potentially tense region of the world is redefining certain longstanding national interests, and shows how this shift is the result of changing power relations, the desire to protect hard-won economic gains, as well as growing trust in new processes designed to foster regional cooperation over regional conflict. Presenting new and timely research on topics that are vital to the security future of one of the world's most important geographical regions, this book will be of great value to students and scholars of Asian politics, regionalism, international politics and security studies.