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Drone technology has already moved a step closer to a fully autonomous state in the form of the X-47B, a super-charged UAV developed by the US Navy that can fly itself, and which last week completed the first takeoff from an aircraft carrier. The drone is billed as a non-combat craft, yet its design includes two weapons bays capable of carrying more than 4,000lbs.Britain is developing its own next generation of drone, known as Taranis, that can be sent to tackle targets at long range and can defend itself from enemy aircraft. Like X-47B it has two in-built weapons bays, though is currently unarmed.

South Korea has set up sentry robots known as SGR-1 along the Demilitarized Zone with North Korea that can detect people entering the zone through heat and motion sensors; though the sentry is currently configured so that it has to be operated by a human, it is reported to have an automatic mode, which, if deployed, would allow it to fire independently on intruders.

the Pentagon is spending about $6bn a year on research and development of unmanned systems, though in a directive adopted last November it said that fully autonomous weapons could only be used "to apply non-lethal, non-kinetic force, such as some forms of electronic attack".

The possibility of "out of the loop" weapons raises a plethora of moral and legal issues, Heyns says. Most worryingly, it could lead to increasing distance between those carrying out the attack and their targets: "In addition to being physically removed from the kinetic action, humans would also become more detached from decisions to kill – and their execution."