After Post-Cold War Era, Sino-Japanese Security Relationship has been changing. In the process of contact with each other between the two neighboring nations, of which one is the rising Mainland China and the other is the Japan engaging to promote its political status, the Taiwan Factor is the focus for the development of bilateral relations of Sino-Japanese Relationship. The scholars in Mainland China think that the ambitions of Japan to Taiwan didn’t come to an end with the end of Japanese rule of Taiwan and that Americans are those who overtly interfere in Taiwan affairs, while those who make Mainland China uneasy even when eating and sleeping are Japanese. Meanwhile, Japan declares the principle of "One China" on one hand, and also suggest Taiwan Strait maintain the status quo on the other hand. By maintaining the stances, Japan hopes to maximize national benefits in the process of negotiation with Mainland China.
When a country enhances its own power, especially its military power, the associated countries will feel ill at ease. The one which enhances its own power will interpret its action as a defense; while the other one will interpret it as a probable threatening. In the interaction between Mainland China and Japan, they take their strategies of war and they both focus upon Taiwan for the purposes of attaining the relative superiority to the other or weakening the other’s power. Nowadays, Taiwan situates on a geographical location of great strategic value, which makes Taiwan have more complicated influences upon the security of Asia-Pacific region.
After Post-Cold War Era, the dispute of territory and energy between Mainland China and Japan makes the conflicts between each other reemerge. The tensions and threatening relationship became more apparent after the Taiwan Strait Crisis in 1996. The trial of missile shooting of Mainland China to the Taiwan Strait made both government and public in Japan recognize that any progress of the conflict in the Taiwan Strait has an impact on its own security. In the Taiwan Strait Crisis, Japan realized that the crisis of the Taiwan Strait is equal to Japan’s crisis. Japan emphasized that the secure relationship between Japan and U.S.A. needed to be intensified further. In the joint statement of U.S.-Japan Security Consultative Committee (SCC) in February, 2005, Japan changed its attitude used to be and collaborated with U.S.A. to put the Taiwan Strait as a common strategic objective.
Neither for the purpose of determination to defy Mainland China, nor inclination to start military war, Japan collaborates with U.S.A. to give common concerns for the security of the Taiwan Strait and enhance its military power for achieving the goal of military persuasion. In face of future perspectives of East Asia, in view of a short term period, it will remain unchanged for Japan to diverse Mainland China through the alliance with U.S.A. The best benefits for Japan are still the alliance with U.S.A., the claim for the peace of the Taiwan Strait, and the maintenance for the status quo across strait.
In view of a long term period, Japan will turn into a nation with leading political power and Mainland China will also be more influential than today. Though there are so many debates in current security relationship as to lead to a great tension between each other, which is a transient phenomenon, the debates are in order to test the baselines of each other and the strategies of resilience. Afterward, Mainland China and Japan will fall into the relationship with close collaborations not only in economics, but also in politics and security. The trends for integration of regional economics in East Asia will specially fasten the transition of this process.