Under Secretary of State for Arms Control and International Security
Appears in 1 story
Active; leading US nuclear diplomacy
No country has acknowledged conducting a nuclear test since 1998. On February 6, 2026, the United States accused China of secretly breaking that taboo by detonating a nuclear device at its Lop Nur test site in June 2020. Beijing masked the explosion using underground caverns that muffle seismic waves.
Updated May 29
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