South Korea demands seat on US nuclear-options review
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- US Under Secretary of War for Policy Elbridge Colby told the Strategic Command Deterrence Symposium on August 5 that Washington is developing more "sensible nuclear options," including low-yield capabilities for regional contingencies, remarks that triggered renewed debate in South Korea over whether those weapons could return to the peninsula.
- A Reform Institute survey of South Koreans on August 11 found 75.1% support for redeploying US tactical nuclear weapons, rising to 88.4% among respondents in their 20s and 86.3% among those in their 30s.
- Asked to rank the top priority for addressing the North Korean nuclear threat, 36.3% of South Korean respondents chose strengthening the US nuclear umbrella and missile defense, exceeding support for an indigenous arsenal (26.9%), tactical redeployment (16.9%), or diplomacy (16.8%).
- On the credibility question of whether the US would retaliate with nuclear weapons if North Korea struck the South even at risk to the American homeland, respondents split nearly evenly: 41.8% said yes, 41.7% said no.
- The US deployed nuclear weapons in South Korea from 1958 to 1991, peaking at roughly 950 warheads, withdrawn under President George H.W. Bush's Presidential Nuclear Initiatives rather than a Korea-specific threat assessment.
- Washington already fields the W76-2 low-yield submarine-launched warhead and is developing the nuclear-armed sea-launched cruise missile (SLCM-N), capabilities the authors say can provide regional deterrence without permanently stationing weapons on South Korean or Japanese soil.
- The US-ROK Nuclear Consultative Group (NCG) was created to deepen South Korean input on deterrence planning, but the authors warn it risks becoming a mechanism that merely informs Seoul after major nuclear-employment decisions have already been made.
- The SLCM-N program was launched under Trump's first term, targeted for cancellation in Biden's 2022 Nuclear Posture Review, and preserved through congressional appropriations — illustrating the partisan whiplash the authors say undermines allied confidence in US extended deterrence.
Why it matters: The near-even split (41.8% vs. 41.7%) on whether the US would trade American cities to defend Seoul exposes a credibility gap in extended deterrence that no amount of new warhead designs fixes without allied buy-in. With the classified nuclear-employment guidance now under review in Washington and the NCG as the only formal consultation channel, the practical question is whether Seoul gets input before options are set or merely notification after — and whether a bipartisan US posture can outlast the next administration change.
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