The equipment and personnel have to get there somehow and re-supply and parts, too. They also can’t do anything but the largest of UAVs from a distance. As I have said before, we built those technologies, we know how to keep them from being used against us.
We built the technology of the airplane, but that didn't stop it from being used against us on Dec 7, 1941 or Sept 11 2001.
The Chinese are not technologically backwards, and will likely sell kits to people hostile to us.