The US could refuse to talk to them by adjusting the routes to their IP ranges, that's about it. Everyone else that wants to talk to China could still do it, pr

The US could refuse to talk to them by adjusting the routes to their IP ranges, that's about it. Everyone else that wants to talk to China could still do it, provided they make sure their routes for Chinese IPs do not go trough the US (obviously hard to do for a number of American residents, or some countries). This would still be circumventable trough a VPN that brings packet outside of the denied routing area.