President Donald Trump’s recent primetime address on election security further exposed China as a direct threat to American national security, alleging China obtained 220 million U.S. voter files, a claim backed up by declassified intelligence documents. Against this backdrop of escalating transnational aggression, the wrongful detention of American scientist Youlin Chen for nearly two years underscores how far Beijing’s repressive tactics have evolved.
Chen, a 54-year-old Chinese-born naturalized U.S. citizen, is a seismologist who specializes in detecting underground nuclear tests. In December 2020, he published a technical report for the U.S. government, using publicly available seismic data collected in China to analyze North Korea’s six known nuclear detonations that occurred between 2006 and 2017. The report remains accessible on the Defense Technical Information Center website and contains no classified information.
On November 5, 2024, Chinese state security arrested Chen at Beijing Capital International Airport as he prepared to return home after a family visit and academic lectures. The Chinese authorities waited until May 2025, nearly seven months after Chen’s arrest, to formally charge him with espionage, an offense that can carry life imprisonment or, in extreme cases, the death penalty.
To date, Chen has not stood trial and remains in detention. As is typical in Chinese national security cases, the proceedings are conducted behind closed doors with minimal public evidence disclosed. Since the Chinese judicial system has a 99 percent conviction rate, any trial is largely a formality and Chen is nearly certain to be found guilty by a Chinese court.
Chen’s wife, Yufang Rong, describes the “harsh conditions” he has been subjected to since his arrest: prolonged sitting on a hard stool, denial of medication for his diabetes, and insufficient food lacking adequate protein. As a result, he has lost 30 to 50 pounds. Chinese authorities have also barred direct family contact. During U.S. consular visits, Chinese officials are always present, preventing private conversations.
Chen’s family and some U.S. officials suspect that the espionage charges against him are pretextual. Rong revealed that Chinese interrogators have questioned Chen over 100 times about his expertise in nuclear seismology, knowledge that China likely seeks to improve its ability to conceal future underground tests and circumvent international monitoring.
Chen’s detention unfolds during a critical time as China rapidly accelerates its nuclear arsenal expansion. According to the Pentagon’s 2025 Chinese Military Power Report, Beijing’s stockpile has surpassed 600 warheads, a figure that has more than tripled since 2020, and is on track to is on track to surpass 1,000 by 2030.
In early February, the New Strategic Arms Reduction Treaty (New START), a bilateral nuclear arms control agreement between the United States and Russia, expired without a new treaty to replace it. A consistent criticism of New START has been China’s exclusion. Washington insists that any future nuclear arms control talks must include Beijing, the world’s fastest-growing nuclear power.
Beijing has resisted these calls while claiming adherence to the 1996 Comprehensive Nuclear-Test-Ban Treaty (CTBT), which prohibits all nuclear explosions for both civilian and military purposes, regardless of the environment—whether underground, underwater, in the atmosphere, or in space. The Trump administration has challenged this, alleging China conducted low-yield tests in 2020 using chamber techniques to suppress seismic signatures, an accusations Beijing denies.
In this context, Chen’s detention sends a chilling message: China’s “hostage diplomacy” has evolved. Besides targeting political dissidents with foreign passports to extract diplomatic concessions, Beijing is now weaponizing its justice system against foreign scholars whose expertise is either useful for the regime or threatens its strategic ambitions. As the U.S. and China strategic competition heats up, Beijing has also demonstrated more willingness to go after American citizens.
The pattern is familiar. Just last month, U Min Zin, a U.S. citizen and UC Berkeley doctoral candidate specializing in Myanmar politics, was arrested in Kunming on similar espionage charges while attending an academic conference he was invited to speak.
The Trump administration clearly recognizes the seriousness of Chen’s case. Secretary Rubio has designated Chen as being “wrongfully detained,” and making his release a priority. During his state visit to China in May, President Trump reportedly raised Chen’s case to Chinese leader Xi. Yet, Xi remains unyielding, indicating that mere quiet diplomacy is insufficient.
As long as China continues this troubling practice, American scholars, especially those of Chinese descent, should exercise extreme caution when considering traveling to China.
Furthermore, the United States should recognize the systematic abduction of American citizens as a deliberate tactic of Chinese statecraft that warrants a decisive and comprehensive response. To address this, Washington must adopt a more assertive strategy: linking high-level summits and economic negotiations to tangible progress on behalf of detained Americans, implementing targeted sanctions against officials involved in hostage diplomacy, and publicly naming every case of wrongful detention. This approach is essential to safeguard our citizens’ safety, and our national security.
