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International alliances during the Cold War era were determined by the requirements of the superpowers and the calculations of the smaller states. As noted above, Europe became the main arena of conflict between the superpowers. In some cases, the superpowers used their military power to bring countries into their respective alliances. Soviet intervention in east Europe provides an example. The Soviet Union used its influence in eastern Europe, backed by the very large presence of its armies in the countries of the region, to ensure that the eastern half of Europe remained within its sphere of influence. In East and Southeast Asia and in West Asia (Middle East), the United States built an alliance system called —SEATO and CENTO. The Soviet Union and communist China responded by having close relations with regional countries such as North Vietnam, North Korea and Iraq.

What is the full form of SEATO?

South-East Asian Treaty Organisation

The correct answer is Option 2 - South-East Asian Treaty Organisation

SEATO- South-East Asian Treaty Organization

During the Cold War period, in East and Southeast Asia and in West Asia (Middle East), the United States built an alliance system called — The Southeast Asian Treaty Organisation (SEATO) and the Central Treaty Organisation (CENTO).
SEATO (Southeast Asia Treaty Organization) became inactive in 1977. SEATO was a collective defence organization formed in 1954 to counter the spread of communism in Southeast Asia. However, it lost its relevance over time, and the organization officially dissolved in 1977.