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The Vision and Failure of a ROK-Led Defense Alliance through APACL: Focusing on the Tension between the US Strategic Dilemma and Syngman Rhee’s Anti-Communist and Anti-Japanese Threat Perceptions

  • military history
  • 2026, (139), pp.79~126
  • Publisher : Military History Institute, MND
  • Research Area : Humanities > History
  • Received : April 10, 2026
  • Accepted : May 12, 2026
  • Published : June 15, 2026

Joonseok Yang 1

1국민대학교

Accredited

ABSTRACT

This study reconstructs the vision and development of a ROK-led security alliance initiative based on APACL and analyzes its failure through two factors: the US strategic dilemma and Syngman Rhee’s anti-communist and anti-Japanese threat perceptions. The failure of the ROK-led defense alliance stemmed from structural constraints arising from the US dilemma toward the ROK: Although the United States regarded the ROK as an “indispensable anchor” in its anti-communist strategy and island defense line in Asia, it simultaneously feared the risks of escalation and loss of control associated with Rhee’s independent actions. Consequently, Washington did not support the formation of a ROK-led anti-communist organization, and the ROK’s exclusion from SEATO further reinforced Rhee’s pursuit of an autonomous security initiative such as APACL. At the same time, Rhee’s anti-communist stance coexisted with strong anti-Japanese sentiment, leading him to reject any regional defense arrangement that included Japan. This limited the institutional expansion of his security vision. Consequently, the interaction between US control concerns and Rhee’s threat perception generated structural tension, resulting in the failure of APACL’s institutionalization. Despite this outcome, the APACL initiative represents an early case in which a weaker ally sought to expand autonomy and exert diplomatic leverage within a US-centered alliance order.

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