China on 15 July 2026 has detained a 54‑year‑old U.S. seismologist, Chen Youlin, who had spent nearly two years researching North Korean nuclear tests. The arrest came during a family trip to Beijing, the family claims.
Chen, who became a U.S. citizen in 2011, had worked with Chinese colleagues on seismological projects that improved nuclear‑test monitoring. His wife, seismologist Rong Yufang, says the alleged espionage charges are false and inconsistent with the transparency of their joint work.
The U.S. Senate and advocacy groups have accused Beijing of holding Chen unjustly, noting the lack of legal counsel and repeated interrogations. Senator Edward Markey urged the Chinese government to release him, warning that the case could discourage academic collaboration.
China denies any wrongdoing and says its judicial system will handle the case in accordance with the law. Espionage convictions in China can carry severe penalties, including life imprisonment.
Experts link the detention to China’s suspected covert nuclear testing, which the U.S. claims violates the Comprehensive Nuclear Test Ban Treaty. Chen’s expertise in seismic detection could help China circumvent this treaty, raising concerns about dual‑use technology.
The case comes after China arrested another American scholar, Min Zin, on similar espionage accusations.
