U.S. Senate supports nuclear submarine cooperation with South Korea, directs assessment of Pacific security impact

The U.S. Senate has signaled strong support for bilateral cooperation with South Korea on the development of nuclear-powered submarines. In a report accompanying the National Defense Authorization Act for fiscal year 2027, the Senate Armed Services Committee explicitly backed joint efforts in submarine manufacturing.

The committee's report also directed the Secretary of Defense, in coordination with the Secretary of State, to submit a report to Congress by February 1, 2027. This report must assess the potential positive implications for stability and security in the Indo-Pacific region stemming from South Korea's acquisition of nuclear submarines.

Further details requested in the report include the scope of bilateral cooperation on South Korea's nuclear submarine development, an evaluation of the impact on regional security, an assessment of proliferation risks associated with South Korea obtaining nuclear submarines, and an analysis of the costs associated with deploying such a fleet and its effect on South Korea's efforts to regain wartime operational control.

This Senate endorsement is seen as a positive development for South Korea, which officially began consultations with the U.S. on implementing security agreements made during a recent summit, including the acquisition of nuclear-powered submarines. A central point of discussion between the two nations is expected to be the method of nuclear fuel procurement and potential amendments to the current atomic energy agreement, which restricts the export of U.S.-origin uranium to civilian and commercial uses only.