South-East Asia
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Leaders of ASEAN and Yasuo FukudaMain articles: Philippine-Japanese relations and Japanese-Vietnamese relations
By 1990 Japan's interaction with the vast majority of Asia-Pacific countries, especially its burgeoning economic exchanges, was multifaceted and increasingly important to the recipient countries. The developing countries of the Association of Southeast Asian Nations (ASEAN) regarded Japan as critical to their development. Japan's aid to the ASEAN countries totaled US $1.9 billion in Japanese fiscal year (FY) 1988 versus about US $333 million for the United States during U.S. FY 1988. Japan was the number one foreign investor in the ASEAN countries, with cumulative investment as of March 1989 of about US $14.5 billion, more than twice that of the United States. Japan's share of total foreign investment in ASEAN countries in the same period ranged from 70 to 80 percent in Thailand to 20 percent in Indonesia.

In the late 1980s, the Japanese government was making a concerted effort to enhance its diplomatic stature, especially in Asia. Toshiki Kaifu's much publicized spring 1991 tour of five Southeast Asian nations?Malaysia, Brunei, Thailand, Singapore, and the Philippines?culminated in a May 3 major foreign policy address in Singapore, in which he called for a new partnership with the ASEAN and pledged that Japan would go beyond the purely economic sphere to seek an "appropriate role in the political sphere as a nation of peace." As evidence of this new role, Japan took an active part in promoting negotiations to resolve the Cambodian conflict.

In 1997, the ASEAN member nations and the People's Republic of China, South Korea and Japan agreed to hold yearly talks to further strengthen regional cooperation, the ASEAN Plus Three meetings. In 2005 the ASEAN plus Three countries together with India, Australia and New Zealand held the inaugural East Asia Summit (EAS).

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