the state department is a diplomatic apparatus, rather than an enforcement apparatus. They will have to declare war, or some other kind of sanctions, and hope t

the state department is a diplomatic apparatus, rather than an enforcement apparatus. They will have to declare war, or some other kind of sanctions, and hope that the country under sanction will comply. I doubt that the US will do it for small numbers of citizens, esp. after these travel advisories given. These travel advisories are essentially saying that you're on your own if you get fucked by china, so don't visit there.