China has confirmed the arrest of U.S. Citizen U Min Zin on suspicion of engaging in espionage and endangering the country’s national security. Chinese Foreign Ministry spokesman Lin Jian stated on Friday that the political analyst has faced “criminal compulsory measures.” According to CBS News, the arrest occurred on June 3 at Kunming airport in Yunnan province, where Min Zin was reportedly attending a meeting. Min Zin is identified as a founder and Executive Director of the Institute for Strategy and Policy Myanmar (ISP-M), a think tank based in Chiang Mai, Thailand. The organization researches political, resource, and conflict dynamics in Myanmar, specifically focusing on China’s influence and interests in the region. Reports from the New York Times indicate that Min Zin is also a PhD student at the University of California Berkeley and currently resides in Thailand, though he spends time in both the U.S. And Myanmar. The BBC noted that such arrests of U.S. Citizens on national security charges are uncommon. The detention follows a period of high-level diplomacy, occurring weeks after President Donald Trump attended a summit in Beijing with President Xi Jinping. Also, the BBC reported that Myanmar’s President Min Aung Hlaing is scheduled to visit Beijing next week. The U.S. State Department told the New York Times on Thursday that it is aware of reports regarding a U.S. Citizen detained in China and stated it works to provide consular assistance. The Chinese Embassy in Washington told the same outlet that foreigners must observe Chinese laws and that those who commit crimes will be held legally accountable. Neither the U.S. State Department, the ISP-M, nor the Chinese Embassy immediately responded to requests for comment from CBS News.