Both fronts use DJI drones[0][1], although DJI suspended its activities in both Russia and Ukraine as of April 26, 2022[2] and contractually forbids[3] any sales by dealers to either country and for combat use.
However, other actors are entering the war business, like Parrot[4].
They still use mostly DJI drones by burning an older firmware and using an anonymizer to hide takeoff and pilot's position from a potential aeroscope. DJI's are pretty cheap and really good at what they are doing.