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US, South Korea discuss nuclear cooperation in security talks

Published by Global Banking & Finance Review

Posted on June 3, 2026

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· Last updated: June 3, 2026

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US and South Korea Hold Talks on Nuclear Cooperation and Security Agreements

Inaugural Nuclear Cooperation Talks and Security Agreements

By Joyce Lee

Background and Purpose of the Talks

SEOUL, June 3 (Reuters) - South Korea and the U.S. held inaugural talks this week to discuss nuclear cooperation under a joint fact sheet on security agreed by U.S. President Donald Trump and South Korean leader Lee Jae Myung last year, Seoul said on Wednesday.

Key Issues on the Agenda

The talks, held on Tuesday and Wednesday, were due to cover Seoul's push for expanded uranium enrichment and spent-fuel reprocessing rights to support its plan to build nuclear-powered submarines, South Korea's Foreign Ministry said previously.

Delegations and Leadership

South Korea's delegation was led by First Vice Foreign Minister Park Yoon-joo, while the U.S. side was headed by Allison Hooker, the State Department's under secretary for political affairs, the ministry said.

Details of the Discussions

The meeting agenda included both "the issue of expanding enrichment and reprocessing rights" and "the issue of nuclear-powered submarines," ministry spokesperson Park Il told a briefing on Tuesday.

Park said discussions on enrichment and reprocessing were tied to revising the existing nuclear agreement and were "purely for civilian and commercial purposes."

By contrast, nuclear-powered submarines would require a separate track since they involve military use of nuclear material, he said.

"Because nuclear-powered submarines are related to the military use of nuclear energy, a separate agreement will be needed under U.S. energy law," Park said.

Outcomes and Future Steps

The two countries agreed to work toward producing substantive results as soon as possible, establish a framework to review progress during the year, and accelerate future consultations, the ministry said on Wednesday.

Joint Fact Sheet and US Support

The U.S.-South Korea joint fact sheet issued in November said Washington supported a process that could lead to South Korea's civil uranium enrichment and spent-fuel reprocessing for peaceful uses.

It also said the United States had approved South Korea building nuclear-powered attack submarines and would work with Seoul on requirements, including fuel sourcing.

South Korea's Nuclear Submarine Ambitions

South Korea aims to launch its first nuclear-powered submarine by the mid-2030s, using low-enriched uranium fuel and building the vessel domestically, Defence Minister Ahn Gyu-back said last month.

Current Nuclear Agreement Limitations

Under the current nuclear agreement between the countries, South Korea is not allowed to reprocess spent nuclear fuel, or to enrich uranium for military purposes, even though it possesses nuclear reactors to generate power.

(Reporting by Joyce LeeEditing by Ed Davies)

Key Takeaways

  • First round of two‑day security consultations held in Seoul June 2–3, 2026, involving key officials from both sides (en.yna.co.kr).
  • South Korea is seeking revisions to the 123 Agreement to secure rights for civilian uranium enrichment and spent‑fuel reprocessing; these talks mark movement toward ‘advance consent’ mechanisms (koreajoongangdaily.joins.com).
  • Seoul aims to launch its first domestically built nuclear‑powered submarine fueled by low‑enriched uranium by the mid‑2030s, pending US cooperation on fuel sourcing (axios.com)

References

Frequently Asked Questions

What was the focus of the US-South Korea nuclear cooperation talks?
The talks focused on expanding South Korea's uranium enrichment and spent-fuel reprocessing rights, as well as supporting plans for nuclear-powered submarines.
Who led the delegations in the nuclear cooperation talks?
South Korea's delegation was led by First Vice Foreign Minister Park Yoon-joo, while Allison Hooker led the US side.
Why does South Korea want to expand uranium enrichment and reprocessing rights?
South Korea seeks these rights to support its plan to build nuclear-powered submarines and enhance its civil nuclear capabilities.
What restrictions currently exist on South Korea under the nuclear agreement?
South Korea is not allowed to reprocess spent nuclear fuel or enrich uranium for military purposes under the current agreement.
What is South Korea's goal for deploying nuclear-powered submarines?
South Korea aims to launch its first nuclear-powered submarine by the mid-2030s, using low-enriched uranium fuel and domestic construction.

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