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China Detains US Scientist Who Studied North Korea Nuclear Tests

Advocates say Chen’s research on North Korean nuclear tests may have drawn Chinese suspicion and he could face life in prison or the death penalty.

  • On Tuesday, relatives of Boston-based seismologist Youlin Chen broke their silence regarding his detention in China, where he has been held without trial for nearly two years.
  • Detained in November 2024 while visiting family in Beijing, Chen faces espionage charges that Global Reach describes as "likely an effort by Chinese officials to learn about the techniques the U.S. uses to detect nuclear tests."
  • Yufang Rong, Chen's wife, stated she has not spoken to her husband for over 600 days and is concerned for his health; U.S. Embassy personnel have visited but remain barred from discussing the case.
  • President Donald Trump raised the case with Chinese President Xi Jinping during a May meeting in Beijing, and White House spokesperson Anna Kelly noted the administration has reunited over 100 individuals with their families since taking office.
  • Secretary of State Marco Rubio designated Chen a wrongful detainee in March, positioning the case as high-priority; adviser Eric Lebson said it could "figure prominently" when Xi meets President Trump in Washington in September.
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Specialist in the use of seismic data to identify nuclear tests, including those conducted by North Korea, Chen Youlin was detained in China in November 2024. Almost two years later, the family denounces the lack of information about his case and demands his release

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For over 600 days, a US researcher has been in Chinese custody. His expertise in underground nuclear tests could have been a disaster to him.

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ussanews.com broke the news on Monday, July 13, 2026.
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