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In post war era, Japan emerged as a pacifist country. The constitution of Japan restrained from developing armed forces for offensive but permitted only for defensive purpose. Thus, Japan raised Self Defense Force. This posture greatly contributed in its emergence as world economic power. In post-cold war period, Japan appeared with advanced step in its foreign policy and sent its forces abroad as a part of UN Peace Keeping Force abroad. It little questioned the objective of creating SDF. 9/11 incidents changed the global politics. Japanese citizens also fall prey to it. Japan joined coalition on War on Terror and helped to fight against terrorism. In post 9/11, Japan has improved its relations with China despite territorial dispute. However, it plays its role in global political, economic, cultural and strategic areas.