Japan's Twin-Track Diplomacy during the Cambodian Conflict, 1979-84: A Member of the West Pursuing an Independent Foreign Policy

The Cambodian conflict and the increase of the Cold War tension following the Soviet invasion of Afghanistan posed major challenges to Japan's Southeast Asia policy but, contrary to what is claimed in the existing research, did not halt Tokyo's efforts to promote peaceful coexistence between the countries of ASEAN and Indochina. Declassified documents and other primary sources show that through the adoption of a twin-track diplomatic line, Japan acted as an Asian member of the West, committing to the anti-Soviet alignment but at the same time continuing to pursue its regional objectives. By engaging Vietnam and striving for a regional solution to the Cambodian conflict, Japan followed an independent diplomatic line, eventually expanding its role in Southeast Asia beyond the economic dimension to security issues. In the end, Japan's bridging efforts in Southeast Asia, envisioned by Prime Minister Fukuda in 1977, helped Tokyo to lay the foundation for its involvement in the mature stage of the Cambodian peace process after the late 1980s.