Published by Global Banking & Finance Review®
Posted on January 26, 2026
2 min readLast updated: January 26, 2026
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US and South Korea agree to deepen cooperation on nuclear submarines, enhancing defense ties and regional security amid North Korean threats.
SEOUL, Jan 26 (Reuters) - U.S. Under Secretary of Defense for Policy Elbridge Colby and South Korean Defence Minister Ahn Gyu-back agreed during talks on Monday to deepen cooperation on Seoul's pursuit of a nuclear-powered submarine, South Korea's defence ministry said.
Colby is visiting Seoul on his first overseas trip in the post, which comes as Washington signals it expects South Korea to take a more leading role in deterring North Korea.
In a statement, the ministry said both sides viewed cooperation on a nuclear-powered submarine as a step that would strengthen South Korea's ability to lead the defence of the peninsula and elevate the security alliance.
The Pentagon's new National Defense Strategy released on Friday said that it expects a "more limited" U.S. role in deterring North Korea, with South Korea taking the primary responsibility.
Ahn also pressed for faster progress on the transfer of wartime operational control to Seoul and called for closer coordination on alliance follow-up measures, the ministry said.
Colby, the Pentagon's top defence and foreign policy official, said in a post on X on his arrival that South Korea is a "model ally" committed to increasing defence spending in line with U.S. regional strategy.
South Korea hosts about 28,500 U.S. troops and last year pledged to lift defence spending to 3.5% of GDP, a move that Colby and other U.S. officials have praised as strengthening Seoul's role in deterring North Korea.
Colby will also visit Japan during his Asian trip, according to media reports.
(Reporting by Kyu-seok ShimEditing by Ed Davies)
Nuclear-powered submarines are submarines that use nuclear reactors as their power source. This allows them to operate underwater for extended periods without surfacing for fuel.
South Korea plays a crucial role in regional security, particularly in deterring threats from North Korea. It collaborates with allies, such as the United States, to strengthen defense measures.
Operational control transfer refers to the process of transferring military command and control from one nation to another, enhancing the recipient nation's ability to manage its defense operations.
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