The United States has imposed restrictions on exports to China's biggest chip maker SMIC after concluding there is an "unacceptable risk" equipment supplied to it could be used for military purposes.

source https://gadgets.ndtv.com/laptops/news/smic-us-tightens-exports-to-chinas-chipmaker-citing-risk-of-military-use-2301699#rss-gadgets-all