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US accuses China of secret nuclear testing

The U.S. alleges China conducted secret nuclear tests in 2020 and calls for a new arms treaty including China to address its rapidly expanding arsenal, now over 600 warheads.

  • On Friday, Thomas DiNanno, Under Secretary of State for Arms Control, accused China of conducting nuclear tests, including a June 22, 2020, yield-producing detonation, at the Conference on Disarmament in Geneva.
  • U.S. officials argue China’s rapid arsenal growth and alleged Russian assistance underpin calls for a broader treaty involving Beijing, while DiNanno said Beijing prepared tests with yields in the hundreds of tons and masked detonations.
  • Evidence cited includes satellite imagery showing Lop Nur tunnel excavations and a State Department report raising concerns about 2020 activity and zero-yield adherence, plus a yield-producing test on June 22, 2020.
  • Kremlin spokesman Dmitry Peskov said, 'There is an understanding, and they talked about it in Abu Dhabi, that both parties will take responsible positions and both parties realize the need to start talks on the issue as soon as possible.'
  • Analysts warn the lapse of New START and frozen U.S.–China nuclear dialogue raise risk of an unconstrained arms race as China grows from low 200s to more than 600 warheads, aiming for 1,000 by 2030.
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US claims Russia and China have violated informal moratorium - US official confirms plans to restart nuclear tests

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Anadolu Ajansı broke the news in Ankara, Türkiye on Thursday, February 5, 2026.
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