This research deals with South Korea–Taiwan relations from 1949, when the concept of a “Pacific Pact” was first introduced, to 1954, when the Asian People's Anti-Communist League (APACL) was formed. Thus far, studies on the regional order of East Asia during the early Cold War period have focused on U.S. policies toward East Asia and U.S. relations with individual East Asian states. In contrast, this present work examines the multilateral nature of the international relations in the region at the time. The extended cooperation, conflict, and competition between South Korea (ROK) and Taiwan (ROC) over the Pacific Pact from 1949 to 1954 vividly show how actively the two nations attempted to engage in the international arena to ensure their own security. Certainly, the primary purpose of this pact was not to form an autonomous regional alliance independent of the United States. In post-World War II Asia, the United States sought to reorganize a new regional order in Asia, with Japan at the center of this proposed order. Under these circumstances, Taiwan and South Korea, standing at the front line of the Cold War, were desperate to attract the U.S.'s attention. Once the two new nations had secured U.S. military and economic aid, however, they no longer pursued their former aggressive and expansive diplomatic strategies. After the Sino-American Mutual Defense Treaty, signed on December 2, 1954, Taiwan discarded the Pacific Pact as an offensive and defensive treaty and concentrated on the APACL. South Korea, for its part, did not further pursue the Pacific Pact after the ROK–U.S. Mutual Defense Agreement was concluded on October 1, 1953.

South Korea and Taiwan maintained an exceptionally close relationship even after signing individual treaties with the United States. At times, the two nations competed to play a leading role in the international relations of Asia. Yet, their differences of opinion did not cross the line of cooperation between the two countries until the collapse of the Soviet Union brought an end to the Cold War system: South Korea then normalized relations with the People's Republic of China (PRC) in 1992.