The Association of Southeast Asian Nations (ASEAN) was formed in 1967 as a regional, economic, cultural, and social cooperative organization. The original five member nations--Indonesia, Malaysia, the Philippines, Singapore, and Thailand (the sixth member, Brunei, was admitted in January 1984)--had little in common in their culture, history, or politics. Nevertheless, after a slow start the organization flourished by 1987 it had the fastest growing GNP of all economic groups in the world and was a key force for regional stability.

ASEAN's charter declares that membership is open to all states in the region--a gesture toward Vietnam that Hanoi repeatedly rebuffed. Before Vietnam's invasion and occupation of Cambodia in December 1978, integration of the three Indochinese states and ASEAN into a larger regional organization was discussed within the ASEAN community as a possible solution to regional problems. The proposal surfaced at an ASEAN summit meeting held in Bali in January 1976, when, following reunification, Vietnam requested observer status at ASEAN meetings. It was understood at the time, however, that the inclusion of communist states within a grouping of free-market countries was unprecedented, and the idea was interpreted to be more a goodwill gesture than a serious proposition.

From 1976 to 1978, ASEAN's differences with Vietnam were both symbolic and real. ASEAN, for example, proposed establishing Southeast Asia as a zone of peace, freedom, and neutrality and invited Vietnam to support the proposal. Hanoi refused but countered with its own proposal, calling instead for a region of peace, independence, and neutrality. Apparently, the Vietnamese objected to the term freedom because of their vulnerability to criticism on human rights issues. The term Independence, on the other hand, was promoted by the Vietnamese as a concept opposing all foreign military bases in Southeast Asia, an idea that many of the ASEAN nations did not share.

During the Second Indochina War, each ASEAN state pursued its own Vietnam policy. Malaysia and Indonesia maintained strict neutrality, whereas Thailand and the Philippines contributed personnel and materiel to South Vietnam. Perceptions of Vietnam as a possible threat to the region also varied among member nations. Indonesia and Malaysia viewed Vietnam as a buffer against Chinese expansionism, whereas Thailand, wary of possible repetition of historic patterns of confrontation with Vietnam, turned to China for protection following the war's end and the subsequent withdrawal of United States forces from Thailand.

Following the 1978 invasion of Cambodia, however, the ASEAN nations were united in their condemnation of Hanoi. They took the lead in mobilizing international opinion against Vietnam, and, in the UN General Assembly, they annually sponsored resolutions calling for withdrawal of Vietnamese troops and for internationally supervised elections. The ASEAN nations also were instrumental in preventing the Vietnam-sponsored Heng Samrin regime in Phnom Penh from taking over Cambodia's UN seat. In June 1982, ASEAN was instrumental i991 in persuading three disparate Cambodian resistance elements to merge into a coalition resistance government (see Laos and Cambodia , this ch.).

ASEAN's position on Cambodia was important to Hanoi, because it was through ASEAN's efforts at the UN that the world's attention continued to focus on Cambodia in the late 1980s. The Vietnamese thus saw ASEAN as having the power to confer upon them or to deny them legitimacy in Cambodia. Vietnamese diplomats sought to convince the ASEAN countries that the invasion of Cambodia was intended to eliminate the threat posed by Pol Pot's alignment with China. Rather than have its activity in Cambodia perceived as potentially damaging to ASEAN's security, Vietnam wanted to assure ASEAN members that it was in the group's interest to join with Vietnam in countering the Chinese threat to the region. Cultivating goodwill with key ASEAN members was an important part of this strategy. Thus, in 1978 Vietnam and the Philippines agreed to negotiate but failed to settle their conflicting claims to the Spratly Islands. Foreign Minister Thach, during a late-1982 visit to Indonesia, took a conciliatory position in discussing Vietnam's and Indonesia's competing claims to the Natuna Islands, and in 1984 Hanoi made a similar gesture to Malaysia in order to help resolve their conflicting claims over Amboyna Cay. In 1987, however, resolving the war in Cambodia remained the key to any further resolution of differences between Vietnam and ASEAN.

Data as of December 1987