WATCH: Russian forces have begun hanging FPV "waiter" drones on power lines, copying a tactic first used by Ukraine.
The drones sit with their engines off, which keeps their noise, visual signature and radio emissions low.
When a vehicle or soldiers pass below, they mount up and attack from above, and from the wires they get a better camera view and dive angle than from the ground.
Ukrainian reports say they can wait more than 24 hours depending on how the electronics are set up.