Thus far, economics favor the attacker in drone warfare, the vehicles are cheap and targeting is globally available for free, while the defense needs expensive radars and missile seekers.
An airborne laser, maybe suspended from an aerostat, might help even that balance, but does not yet exist
afaik.
It is puzzling that there is so little visible emphasis on this emerging technology, despite multiple demonstrations already of the superior cost effectiveness of drone assisted warfare. Practical leadership seems to be in the Middle East. primarily with the Turkish military, now with Armenian and Libyan experience.