South Korea’s Ministry of National Defense published a plan Tuesday to develop nuclear-powered submarines under the Jang Bogo N Project, a long-discussed effort that would expand the country’s naval capabilities and place it among a small group of nations operating such vessels.
The ministry said the submarines would offer “dramatically enhanced operational capabilities” over South Korea’s diesel-electric fleet, including effectively unlimited range and higher mobility. It said the boats “will play a core role in responding to threats such as North Korea’s submarine-launched nuclear and missile threats.”
South Korea has discussed nuclear-powered submarines since at least 2003, but the plan had faced opposition, including from the United States, over proliferation concerns. In October, President Donald Trump wrote on Truth Social that he had approved the plan, saying, “Our Military Alliance is stronger than ever before and, based on that, I have given them approval to build a Nuclear Powered Submarine, rather than the old fashioned, and far less nimble diesel powered submarines that they have now.”
Trump also said some boats would be built in the United States. South Korea’s ministry did not mention that possibility and emphasized domestic development, though the United States could still play a role in propulsion-related support. Last year, South Korea’s defense minister said the country would build its own submarines and modular reactors, while receiving enriched uranium fuel from the United States. The Defense Acquisition Program Administration said South Korea was already developing small nuclear reactors.
The fuel issue is significant because a bilateral agreement bars South Korea from enriching uranium or reprocessing spent fuel without U.S. approval. The announcement indicates Washington has approved the project.