The following is the Jan. 23, 2023, Congressional Research Service In Focus report, Chinese Nuclear and Missile Proliferation.
From the report
The U.S. government has continued to express concerns about China’s record concerning the proliferation of nuclear- and missile-related technologies to other countries, with more recent focus on the threat of Chinese acquisition of U.S.-origin nuclear technology. (See CRS In Focus IF11050, New U.S. Policy Regarding Nuclear Exports to China, by Paul K. Kerr...
https://news.usni.org/2023/01/24/report-to-congress-on-chinese-nuclear-and-missile-proliferation