As I recall the Outer Space Treaty of 1967 holds host countries liable for its provisions, and the move to launch overseas does not remove FAA/US liabilities from domestic companies.
That treaty didn't become a public concern until the present century. It's worth a read.
"Peace in Space, Good Luck on Earth."
From the article: Vector CEO Jim Cantrell told CNBC, adding that the visit included company representatives from Boeing BA , Lockheed Martin LMT , SpaceX and Microcosm.