Thailand, faced with the insurgent activities of the ousted Pol Pot supporters spilling over the common border with Kampuchea, turned to the United States for aid and was promptly given military supplies. The ASEAN nations banded together against the Vietnamese and Soviet expansionism and turned to the world outside for support and in particular for help with the flood of refugees that had begun to pour out of Indochina. Most of all they looked to Washington, as the power in the area best able to counter the military strength of the Soviet Union. Thus the United States became once more politically involved in the region, only a few short years after leaving Vietnam. This time it was not for the containment of China, the original focus of US South-East Asian commitments. Rapprochement with Peking had removed the need for that. Now it was Soviet military activity and expansion that had to be checked. Soviet policies in South-East Asia were all of a piece with its activities elsewhere in the Third World — assertive, opportunist, anti-Western, anti-Chinese; in short, pro-Soviet and with a traditionally Russian flavour to boot.
ASEAN, the association which brought together Malaysia, Singapore, Thailand, Indonesia and the Philippines, had for long been the most promising grouping yet seen in the region, though its purposes were primarily political and economic. Each of the members had its own security problems or preoccupations, some of them severe, but they were of a separate nature. Collectively they did not recognize any external threat to their security and since there was no consensus on security, nor apparently any particular urgency, there was no security structure in ASEAN.
The area ASEAN covered had some strategic significance, however, not only for the energy sources and raw materials it contained, but for its importance as a waterway. Among the hundred or so ships that were passing through the Malacca Strait daily in the early 1980s were those that carried the bulk of Japan's imports of oil and iron ore. For the United States and for the Soviet Union the waterway was important as the passage between the Pacific and Indian Oceans. Access to trade with the region and the preservation of stability to enable this to continue seemed to offer a common interest to all the powers, and the Soviet Union in particular was at pains in the later 1970s to woo the ASEAN states — after initially being ill-disposed to recognize the organization — and to seek closer links. For a time Moscow touted a proposal for an Asian Collective Security Pact, but since this was transparently aimed at opposing China it found no takers in an area conscious that it had to find some way of getting along with that huge and unpredictable country. Yet the Soviet Union was also determined to support Vietnam and the two policies were not compatible.
ASEAN drew away from the Soviet Union, sharply so after the Vietnamese invasion of Kampuchea, and some of its members began to forge closer links with China. The Soviet Union became isolated in Asia, its only allies being Vietnam and a North Korea that was careful to maintain links with China as well. Soviet forces did, however, reap the benefit of the support for Hanoi, in the form of air and naval bases in Vietnam. The Soviet navy began to make use of Cam Ranh Bay in particular, admirably placed halfway between the Far East Fleet and the Soviet naval force in the Indian Ocean, and affording surveillance over the activities of the US Seventh Fleet in the south Pacific.
It was almost inevitable that ASEAN would, under the new circumstances that were unfolding, pay more attention to security concerns. By 1980 the military expenditures of the member states had risen to $5.47 billion, 45 per cent more than the year before and a near doubling compared with 1975. Thailand, dangerously close to Vietnamese military activity in Kampuchea, was already devoting 20 per cent of its budget to military purposes. All were buying modern weapons, with Singapore, Malaysia and Thailand acquiring new tanks, indicating a readiness to resist any incursions by Vietnam. An interesting feature was the growing adoption of American weapons. All the countries operated one model or another of the F-5