Intense new vision has shown how an armoured column was obliterated in what appears to be another deadly miscalculation by Putin’s commanders. Ukrainian forces are using American-supplied scatterable mines to plug holes in their lines and isolate Russian advances. But drones have changed the game. Instead of scattering mines at random, operators can now surgically place them on the exact dirt roads and supply tracks that Russian vehicles use the most.A heavy-lift drone can carry half a dozen mines up to 20km behind the lines while leaving the operator relatively safe behind friendly lines.Their effectiveness is multiplied at night, especially when Russian columns are on the move.But even in daylight, videos show Russian drivers hitting mines they should have spotted.