This paper will ask how Japan should go about establishing a favorable national security environment, and Will consider this through an analysis of Japan’s role in the process. First of all, it will focus on the East China Sea’s Senkaku Islands, while examining China’s maritime expansion and shifting American strategies. From there it will analyze the transformation of the security environment. Next, Japan’s response to the changing security environment in East Asia will be considered, along with the government’s approval of recourse to the right of collective defense. And Finally, attention will be paid to the influence Japan has had on setting up the Security Consultative Committee (known as 2-puls-2) with other major world powers, paving the way to establishing a new security environment.