| Summary/Abstract |
Seoul and Washington have conceded that Terminal High Altitude Area Defense (THAAD) in South Korea cannot protect the capital region of Republic of Korea (ROK), including Seoul and Incheon, from North Korea’s missile attacks. Why did the South Korean government decide to deploy THAAD, risking possible retaliation from China, although it already knew its limited utility on the Korean peninsula? This article addresses the puzzle by connecting the deployment of THAAD in South Korea with the U.S. conception of a strategic rebalancing to Asia. By linking South Korea’s decision to deploy THAAD with contemporary alliance politics, extended deterrence, and abandonment and entrapment risks, it argues that Seoul’s THAAD decision was primarily intended to sustain and strengthen the U.S.-ROK alliance amid escalating nuclear threats by North Korea and deepening Sino-American rivalry.
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