Officials worry a gap in export rules let Chinese firms acquire banned Nvidia Blackwell chips via overseas subsidiaries. New guidance aims to close it.

This is Washington's worst nightmare.

The US Commerce Department quietly posted a notice on its website on Sunday that does something Washington has been dancing around for a year: it shuts a loophole that may have…

Officials worry a gap in export rules let Chinese firms acquire banned Nvidia Blackwell chips via overseas subsidiaries. New guidance aims to close it.