South Korean President Lee Jae Myung says the US supports Seoul’s bid to secure uranium enrichment and spent nuclear fuel reprocessing capabilities.
Published On 14 Nov 2025
The United States and South Korea have released details of a trade agreement that includes a $150bn Korean investment in the US shipbuilding sector, and both countries agree to “move forward” on building nuclear-powered submarines.
Under the agreement, President Lee Jae Myung said on Friday that South Korea will build nuclear-powered submarines as part of a new partnership with Washington on shipbuilding, artificial intelligence and the nuclear industry.
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A fact sheet released by the White House said the US gave approval for Seoul to build nuclear-powered submarines and that South Korea will invest an additional $200bn in US industrial sectors in addition to the $150bn in shipbuilding.
South Korea’s official Yonhap news agency said Seoul’s investment was in return for Washington’s lowering of trade tariffs on Korean goods to 15 percent from 25 percent.
“One of the greatest variables for our economy and security – the bilateral negotiations on trade, tariffs and security – has been finalised,” President Lee said at a news conference on Friday, adding the two countries had agreed to “move forward with building nuclear-powered submarines”.
“The United States has given approval for the ROK (Republic of Korea) to build nuclear-powered attack submarines,” Lee said.
Seoul also secured “support for expanding our authority over uranium enrichment and spent-fuel reprocessing”, he said.
The joint fact sheet outlining the deal said both sides would “collaborate further through a shipbuilding working group” to “increase the number of US commercial ships and combat-ready US military vessels “.
Yonhap also reported that South Korea is seeking to acquire “four or more 5,000-ton conventionally armed, nuclear-powered submarines by the mid-2030s “.
South Korea’s development of nuclear-powered vessels would provide a significant boost to its naval and defence industries, allowing Seoul to join a select group of countries with such technological capabilities, analysts say.
China had already voiced concern over a Washington-Seoul deal on nuclear submarine technology.
Such a partnership “goes beyond a purely commercial partnership, directly touching on the global nonproliferation regime and the stability of the Korean Peninsula and the wider region,” China’s Ambassador in Seoul Dai Bing told reporters on Thursday.
North Korea did not immediately comment on the development, but is likely to respond. Pyongyang has consistently accused Washington and Seoul of building up military forces on the North’s borders in preparation for an invasion one day.
Details remain murky on where the nuclear submarines will be built.
US President Donald Trump said on social media last month that “South Korea will be building its Nuclear Powered Submarine in the Philadelphia Shipyards, right here in the good ol’ U.S.A”.
However, Seoul’s national security adviser Wi Sung-lac said on Friday that “from start to finish, the leaders’ discussion proceeded on the premise that construction would take place in South Korea”.
“So the question of where construction will take place can now be considered settled,” Wi said.
