Big problem are these small quadrocopters....both sides are using them a lot and if they flying low it isn't easy to see them on radar...Im not sure about 100k drones but they are number 2 cause of casualties after artillery fire for most of conflict for both sides
Heres a story related to them
One of our volunteers was squad leader and sometimes replacement company commander when main one was busy in ukr foreign legion back in 22
One day he was in battallion HQ discussing how heavy his sector will be when ukrainian anti-air officer hands him radar readings and his entire sector is covered by red dots (drones)
That guy had some stories lol was interesting since he was in leadership position so he had a bit different view on things
Most nasty thing are very small quadrocopters : they are used to get video etc in order to correct artillery and mortars fire......