The controversy over U.S. restrictions on intelligence sharing, triggered by Unification Minister Chung Dong-young's reference to a "nuclear facility in Kusong, North Korea," is spreading rapidly. Although Chung has defended himself by saying "Kusong is an already known nuclear facility" and that his remarks did not constitute a leak of classified information, the fallout shows little sign of subsiding as the opposition moves to turn the issue into an election campaign talking point. With President Lee Jae-myung both shielding Chung and effectively signaling a hunt for the source of the information leak, there are also signs that the situation could escalate into a line-based conflict within the ruling bloc between the self-reliance faction and the alliance faction.
Sung Il-jong, chairman of the National Assembly's National Defense Committee and a member of the People Power Party, held a press conference at the National Assembly on the 21st and said, "According to information I have obtained as chairman, the commander of U.S. Forces Korea urgently visited Defense Minister Ahn Gyu-back to protest over Minister Chung's mention of Kusong." He added, "It is a measure of how serious a classified leak Minister Chung's remarks were," and called for Chung's resignation.
Earlier, on the 6th of last month, Chung singled out Kusong — a location that had not previously been officially confirmed as a site of North Korea's nuclear facilities — during a session of the National Assembly's Foreign Affairs and Unification Committee. The United States reportedly viewed this as an intelligence leak and partially restricted the sharing of satellite intelligence with South Korea. Chung countered the leak allegations the previous day, saying, "Kusong is a facility already known through reports by the Center for Strategic and International Studies (CSIS), a U.S. think tank, and other sources." Chairman Sung went on the offensive by specifically citing the U.S. protest.
The Defense Ministry spokesperson's office immediately rebutted the claim, saying, "It is neither appropriate in terms of Korea-U.S. military diplomacy nor true that the commander of U.S. Forces Korea protested to the defense minister." However, the controversy was reignited when Victor Cha, Korea Chair at CSIS, denied Chung's explanation on X (formerly Twitter) the same day, stating, "CSIS has never produced a single report on nuclear facilities in Kusong."
With President Lee also weighing in, concerns are emerging that a line-based conflict within the ruling bloc — between the "self-reliance faction," which prioritizes inter-Korean relations, and the "alliance faction," which prioritizes Korea-U.S. cooperation — may be surfacing. On X the previous day, Lee defended Chung, saying, "All claims and actions premised on the notion that Minister Chung 'leaked classified information provided by the United States' are wrong." He added, "We need to look closely into why such an absurd situation is occurring." Diplomatic observers interpreted these remarks as an indication that Lee views the root of the incident as a conflict between the self-reliance and alliance factions.
A government official said, "I understand that the security line also delivered repeated warnings to the Unification Ministry regarding Minister Chung's unilateral remarks." A National Assembly National Defense Committee official said, "There is a possibility that Minister Chung's remarks have cost Korea and the U.S. their human intelligence assets in North Korea," adding, "This is not a matter to be taken lightly." On the other hand, a Unification Ministry official said, "The United States has also recently placed some restrictions on intelligence sharing with the North Atlantic Treaty Organization (NATO)," noting that "the heart of the issue is the leak of the intelligence-sharing matter itself."
