In the emerging complex security situation in the Asia-Pacific region, Japanese security policies appear to be undergoing dramatic changes. The alliance with the US, especially the presence of American troops, is facing with some uncertainty after 9/11. The rise of China as a major economic and military power is seen to pose a serious challenge to Japan. Moreover, North Korea’s unabated attempts to develop WMD capabilities along with ballistic missiles threaten Japanese security directly. In response, Japan has initiated certain significant steps.