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US Cites Seismic Data to Bolster China Nuclear Test Claim

U.S. officials cited seismic data indicating a 2.75 magnitude explosion at China's Lop Nur site in 2020, prompting plans to resume low-yield nuclear testing to maintain strategic parity.

  • On Tuesday, Christopher Yeaw said the United States is ready to match alleged Chinese low-yield tests, citing `As the president has said, the United States will return to testing on a-- quote-- 'equal basis,'` at the Hudson Institute.
  • A remote seismic station in Kazakhstan recorded a 2.75-magnitude event on June 22, 2020 near Lop Nur, China's main nuclear test site, with Christopher Yeaw saying `There is very little possibility that it is anything other than an explosion, a singular explosion`.
  • Independent analysts cautioned the signal was weak and inconclusive, the Comprehensive Nuclear‑Test‑Ban Treaty Organization said it detected no nuclear test, and Lin Jian called the U.S. accusation `completely groundless`.
  • With New START expired on February 5, the U.S. is considering matching alleged Chinese low-yield tests, potentially impacting nuclear arms control efforts.
  • Given that China has only 45 tests, its arsenal nearing 600 warheads and aiming for 1,000 by 2030, Yeaw said, `The treaty becomes basically a fig leaf`.
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58 Articles

Center

The New START nuclear arms control treaty, the last between the United States and Russia, expired this month and President Donald Trump called for a new agreement to include China.

Lean Right

A department head at the U.S. Department of State presents new details of a possible underground nuclear weapons test in China. China rejects the allegations. The organization of the Comprehensive Nuclear-Test-Ban Treaty (CTBTO) is reluctant.

·Vienna, Austria
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Center

The US intends to resume nuclear weapons testing, Assistant Secretary of State for Arms Control Christopher Yeaw said in a speech at the Hudson Institute on Tuesday, recalling that President Donald Trump announced this last October, reports the French news agency AFP.

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Stars and Stripes broke the news in Washington, United States on Tuesday, February 17, 2026.
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