[perihelions]

US banned the sale of American HPC components to Chinese supercomputers.

https://news.ycombinator.com/item?id=9349116 (2015, 93 comments)

https://news.ycombinator.com/item?id=26740371 (2021, 151 comments) etc.

[throwaway4good]

They also prevent Chinese supercomputing related companies having their chips fabbed in Taiwan.