US cites mishandling of sensitive lab data for South Korea’s placement on watchlist

The U.S. Department of Energy has placed South Korea on a sensitive country watchlist, citing concerns over the mishandling of sensitive information by visitors to its laboratories, acting U.S. Ambassador Joseph Yun stated on Tuesday.

The move, which relegates South Korea to the lowest tier of the list alongside countries such as China, Russia, and Iran, has triggered controversy in Seoul. The South Korean government expressed concerns over not being notified by Washington before the decision was made.

“South Korea was put on this list because there was some mishandling of sensitive information,” Yun said while addressing the American Chamber of Commerce in Korea. He refrained from elaborating but highlighted that over 2,000 South Korean students, researchers, and government officials visited U.S. labs last year. Yun also downplayed the broader implications of the designation, stating that it was limited to the Department of Energy’s facilities and would not impact broader U.S.-South Korea cooperation.

Earlier this week, the U.S. energy department confirmed South Korea’s designation as a “sensitive” country, a decision made in January, though specific reasons were not disclosed.

Diplomatic Response from South Korea

Vice ministers in Seoul were scheduled to brief acting President Choi Sang-mok on the matter, while Industry Minister Ahn Duk-geun is set to visit the U.S. to request South Korea’s removal from the list.

The controversy follows a 2024 report by the U.S. energy department detailing an incident in which a contractor attempted to board a flight to South Korea with proprietary nuclear reactor design software from the Idaho National Laboratory. The contractor, under U.S. law enforcement investigation, was reportedly in contact with an unidentified foreign government. It remains unclear whether this case directly influenced South Korea’s watchlist status.

Political Context and Trade Implications

The decision to designate South Korea as a sensitive country was made under the Biden administration and comes amid growing discussions in Seoul about developing its own nuclear deterrence capabilities. This move follows heightened geopolitical tensions and a shock declaration of martial law in December that plunged the South Korean leadership into crisis.

Despite speculation, South Korea’s foreign ministry clarified on Monday that the watchlist designation stemmed from security-related matters tied to a research facility rather than Seoul’s foreign policy.

A U.S. Department of Energy spokesperson confirmed that the designation, set to take effect in April, does not impose new restrictions but mandates additional internal reviews before cooperation or visits involving listed countries.

Meanwhile, Yun also urged South Korea to take measures to help reduce the U.S. trade deficit, which has more than doubled since the first Trump administration. He called for South Korea to remove barriers in the agriculture, digital, and service sectors to ensure balanced trade between the two nations.