Autonomous weapons and the new laws of war

THE HAROP, a kamikaze drone, bolts from its launcher like a horse out of the gates. But it is not built for speed, nor for a jockey. Instead it just loiters, unsupervised, too high for those on the battlefield below to hear the thin old-fashioned whine of its propeller, waiting for its chance.

If the Harop is left alone, it will eventually fly back to a pre-assigned airbase, land itself and wait for its next job. Should an air-defence radar lock on to it with malicious intent, though, the drone will follow the radar signal to its source and the warhead nestled in its bulbous nose will blow the drone, the radar and any radar operators in the vicinity to kingdom come.