Japan’s Diplomatic Strategy toward East Asia: Creation and Evolution of ‘Dual-Track Diplomacy’ in the Post-Cold War Era

Abstract Japan’s diplomatic strategy toward East Asia underwent three main changes in the post-Cold War era. The first change occurred soon after the 1991 Persian Gulf War propelled Japan to consider a potential way to contribute to international security, resulting in the creation of dual-track diplomacy. The second was the consolidation of Japan’s dual-track diplomacy by strengthening the US–Japan alliance and supporting the ASEAN’s multilateral initiatives in the early 2000s. The third was the enhancement of Japan’s own security efforts to maintain regional stability while making the most of the existing political and security mechanisms in East Asia—multilateralizing US alliance networks and enhancing the ASEAN-led multilateral frameworks. In the future, two factors would likely play a critical role in shaping Japan’s diplomatic strategy: the degree of the future US commitment to the alliance with Japan and the level of China’s assertiveness.