Washington Declaration

The Washington Declaration was issued on 26 April 2023 by US President Joe Biden and South Korean President Yoon Suk-yeol during Yoon's state visit to Washington, marking the 70th anniversary of the US–ROK alliance. Its central purpose was to reinforce the credibility of US extended deterrence against North Korean nuclear and missile threats while discouraging Seoul from pursuing an independent nuclear weapons capability — an idea that had gained domestic political traction in South Korea.

Key elements of the declaration included:

• Establishment of a new Nuclear Consultative Group (NCG) to give South Korea a stronger voice in US nuclear planning, contingency discussions, and information-sharing related to deterrence on the peninsula.
• Enhanced visibility of US strategic assets, including the first port visit by a US ballistic missile submarine (SSBN) to South Korea in roughly four decades; the USS Kentucky docked in Busan in July 2023.
• A reaffirmation by South Korea of its commitments under the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) and the US–ROK Agreement for Cooperation Concerning Peaceful Uses of Nuclear Energy (the "123 Agreement").
• Strengthened conventional-nuclear integration, joint exercises, and tabletop simulations.

The declaration stopped short of redeploying US tactical nuclear weapons to South Korea — withdrawn in 1991 — and did not create a NATO-style nuclear sharing arrangement. Analysts at CSIS, Brookings, and the Asan Institute described it as an effort to substitute consultative depth for physical forward deployment.

North Korea condemned the declaration, and China criticized it as escalatory. The NCG held its inaugural meeting in Seoul in July 2023 and a second meeting in Washington in December 2023. The arrangement is frequently cited in debates over nuclear latency, alliance assurance, and the durability of the global nonproliferation regime in Northeast Asia.