It probably wouldn't be necessary for someone like China to actually stage a demonstration, since its easier for China to just have some high up diplomat get themselves drunk and boast to or around a known CIA operative that they have hundreds of drones ready to strike facilities in the USA that can be activated on a moments notice. Then leave just enough of a paper trail lying around in other places to validate it (although probably a dozen or less, not a hundred), without compromising anything. Maybe even go so far to have a private military briefing (that a CIA operative was invited to) which displayed a particular model of drone built using off-the-shelf parts that could be acquired in the US ("we built this on our soil, we could be building another one very much like it on your soil").
