Colonel Yehor Derevyanko is getting impatient. Three Russian soldiers, seemingly oblivious to the fact that they are being watched, walk down a country road. “Kill them!” he snaps. Two loitering drones are despatched. The bunker beneath the eastern city of Kostiantynivka contains five screens showing drone feeds and three men using laptops. Suddenly one blurts out: “Fuck, we’ve lost them!”