if the downward facing radar sees them then it's already too late -- that drone gonna hit something or it's dropped its payload.
a couple of RPG sized rounds dropped from 10000 ft up could easily close runways and shutdown an airport for hours. hell just being there and being UFO could lead to all sorts of flight re-routing and chaos
Payload? You don’t need actual explosives to cause disruption, and for a state-sponsored actor to use them would be an act of war. The perfect being the enemy of the good here, provisioning for less hostile cases seems eminently sensible.
a couple of RPG sized rounds dropped from 10000 ft up could easily close runways and shutdown an airport for hours. hell just being there and being UFO could lead to all sorts of flight re-routing and chaos