US and South Korea Strengthen Nuclear Submarine Cooperation Amid Regional Security Concerns

In a significant move signaling closer defense ties, the United States and South Korea have agreed to deepen cooperation on Seoul’s pursuit of a nuclear-powered submarine. The agreement came during talks on Monday between U.S. Under Secretary of Defense for Policy Elbridge Colby and South Korean Defense Minister Ahn Gyu-back, South Korea’s defense ministry confirmed.

Colby, on his first overseas trip since taking the post, emphasized that South Korea is a “model ally,” committed to enhancing its defense capabilities and aligning with the broader U.S. regional strategy.

The talks highlighted the growing expectation that South Korea will take a more leading role in deterring North Korea. The Pentagon’s recently released National Defense Strategy noted a “more limited” U.S. role in the region, positioning Seoul at the forefront of the peninsula’s defense.

Both sides agreed that collaborating on a nuclear-powered submarine would significantly strengthen South Korea’s defense leadership and further cement the U.S.-South Korea security alliance. Additionally, Minister Ahn urged faster progress on the transfer of wartime operational control to Seoul and called for closer coordination on alliance measures moving forward.

South Korea, which hosts roughly 28,500 U.S. troops, has committed to increasing its defense spending to 3.5% of GDP, a step applauded by U.S. officials as it reinforces the country’s role in regional deterrence. Colby’s trip will also include a visit to Japan, reflecting the U.S.’s broader strategy of strengthening security cooperation across East Asia.

Beyond the strategy and statistics, these talks reflect a shared commitment to regional stability. For citizens in both countries, it’s a reminder that international security decisions directly impact daily life — from maintaining peace at home to ensuring the safety of families across borders.