Well-made CNC machines are a controlled export item in the U.S. if they have the ability to precisely machine certain materials to create certain parts. See recent news stories about Haas CNCs churning out Russian weapons.
Multiple axis CAM software is also export controlled.
The folks who make the hobbyist machine I linked have a page on this:
https://www.pentamachine.com/blog/whats-the-deal-with-5-axis...
