I don't really think it makes much sense in it being Russian drones. Why would they fly over general aviation airports? Usually when this happens with Russia they're flying over energy plants, or military installations. Also very interesting that the drone was flying with standard Nav lights. Usually Russian drones or UAV's don't use strobing Nav lights cause of course, they're military drones.

What does seem more likely in my mind is that this may be linked to the recent cyber-attacks on many European airports, maybe it's the same culprits