The United States has partially restricted satellite intelligence sharing with South Korea following a public disclosure by Seoul's unification minister of a suspected North Korean nuclear facility, according to South Korean military officials and media reports. The move has exposed tensions within one of Asia's most critical security alliances at a sensitive moment for the Korean Peninsula.
Unification Minister Chung Dong-young triggered the dispute in March when he told lawmakers that North Korea was operating uranium enrichment facilities in Kusong, a north-western region of North Korea that had not previously been officially confirmed as a nuclear site alongside the better-known facilities at Yongbyon and Kangson. A senior South Korean military official confirmed on Tuesday that Washington had imposed partial restrictions on sharing satellite-gathered intelligence related to North Korean technology since early this month, though surveillance of missile activity and other critical military movements has continued normally, leaving South Korea's readiness posture unaffected.
Washington has not officially confirmed the restrictions on record, but US officials reportedly lodged multiple protests with Seoul, arguing that sensitive information had been disclosed without authorisation. Chung has firmly rejected that characterisation, insisting his remarks drew on publicly available research, including a 2016 report by the Institute for Science and International Security — a US think tank — which identified a suspected centrifuge research facility near Panghyon air base in the Kusong area, albeit as a preliminary finding requiring further confirmation. He also noted that he had mentioned Kusong during his confirmation hearing the previous year without any objection from Washington. South Korea's unification ministry maintains that no classified intelligence was involved.
President Lee Jae Myung, who is pursuing a conciliatory policy toward North Korea, publicly backed his minister. Writing on social media from Delhi during a state visit to India, Lee called it a "clear fact" that Kusong's existence had been widely reported in academic and media circles before Chung's remarks, and said any suggestion that his minister had leaked classified American intelligence was "wrong." By contrast, conservative opposition lawmakers from the People Power party called for Chung's dismissal, describing the episode as a "clear security disaster" that had damaged the alliance with Washington.
The intelligence dispute unfolds against a backdrop of broader alliance friction, with South Korean media also reporting that Washington has raised concerns over pending legislation that would give Seoul authority over access to the demilitarised zone — a buffer strip separating the two Koreas that is currently managed exclusively by the US-led UN Command. Meanwhile, the wider nuclear threat from Pyongyang continues to grow. Rafael Grossi, director general of the International Atomic Energy Agency, said during a visit to Seoul last week that the agency had confirmed a rapid increase in operations at the Yongbyon reactor, estimating that North Korea now possesses a few dozen nuclear warheads. The alliance's ability to monitor that expanding programme will depend in part on how quickly Washington and Seoul resolve their current disagreement.