US intelligence agencies have concluded that China conducted a covert nuclear explosive test in June 2020, violating a self-imposed moratorium, as part of a push to develop a new generation of nuclear weapons, according to multiple sources.
US Intelligence Allegations
US officials assert the test was tied to China's pursuit of next-generation nuclear systems, including:
- Missiles capable of delivering multiple miniaturized warheads.
- Low-yield tactical nuclear weapons for regional deployment scenarios.
Details of the Lop Nur Test
The test occurred at China's Lop Nur facility in June 2020, with a seismic magnitude of 2.75. US State Department officials publicly disclosed the event in February 2025, stating the data confirmed an explosion inconsistent with mining or earthquakes.
China's Denial
China's embassy in Washington rejected the allegations as "political manipulation" aimed at evading US disarmament responsibilities. A spokesperson reiterated China's adherence to a no-first-use policy and testing moratorium, calling the claims unfounded.
Broader Modernization Efforts
China is rapidly expanding its nuclear arsenal, focusing on:
- Enhancing survivability and maneuverability to counter potential US preemptive strikes.
- Addressing reliability concerns in existing systems.
- Accelerating production to close the gap with US and Russian arsenals, as noted in Defense Intelligence Agency reports.
Geopolitical Implications
The US is leveraging the revelation to pressure China into new arms control agreements, amid concerns over Beijing's resistance. The timing aligns with diplomatic efforts ahead of potential US-China engagements, highlighting shifting strategic competition.
Historical Context and Expert Views
China's limited nuclear test history—45 mostly atmospheric tests—may drive secret testing to build data for advanced weapons. Experts note China's nuclear posture, historically defensive, shows signs of evolution, though its official policy remains unchanged.
