Is there an "observatory" that monitors drone warfare - I have heard of drones dropping grenades down tank hatches, and lots of requests from western air forces for anti drone measures but this is the first "big" target I have heard of.

Plus, worryingly, this does seem a fairly automatable attack. The limiting factor for the attackers must be the supply of drones plus any concerns about wiping their geo fencing / remote self destructs built in. As someone who would get his drones from the local curry's I presume the attackers have some other supply channel ?