I will assess the feasibility to construct the cooperative security regime in East Asia, to delineate its prospects and problems, through comparative critical analysis of the three prededental cases: CSCE/OSCE, ARF and KEDO. Through these feasibility studies, I will show the multilateral framework for cooperative security, to revitalize the US-Japan relations and to stabilize "alliance adrift" in the post-hegemonic era. In order to maximize the potentialities of the research, I will make full use of the fieldwork, the localities of my research headquarters will be in placed in various cities: Washington D.C., London and Singapore. Based on my previous research at TARA Center, I will examine several hypotheses of alliance, security and regime-making, to create an alternative scenario for the existing bilateral partnership between U.S. and Japan in a new broader setting of multilateral cooperation. The result is to be published as a book-form and disseminated through convening of international round-table symposium as well.