Assistant Secretary of State for Arms Control and Nonproliferation
Appears in 1 story
Active; elaborating on US intelligence claims
No country has acknowledged conducting a nuclear test since 1998. But on February 6, 2026, the United States accused China of secretly breaking that taboo—claiming Beijing detonated a nuclear device at its Lop Nur test site in June 2020 and masked the explosion using underground caverns that muffle seismic waves.
Updated Feb 18
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