The changing of geopolitical environment in Northeast Asia after the Cold War illustrates some fundamental shift in Japan’s security environment. The post-Cold War era provide a new set of challenges and difficulties that must be diligently comprehend not only by Japanese policy maker but also her military echelon as well. With the receding of Soviet Union threat from the north comes a new and emerging volatile situation from her immediate neighbors; People’s Republic of China and Democratic Republic of Korea. Aside from this, threats from Japan domestic security also did not demonstrate any indication of declination. This article explores each international actor that can be considered as security predicament to Japan and why each actor b...