lethal autonomous weapons system
In plain wordsA weapon that, after a person sets it going, picks out and attacks targets — including people — on its own, with no human deciding each strike. Critics call them killer robots.
A weapon system that, once a person has set it going, can pick out targets and use lethal force against them without a human signing off on each attack. Definitions differ on where the line falls: the US Department of Defense draws it functionally, at choosing and engaging targets without further operator input, while the International Committee of the Red Cross emphasizes that such a weapon fires when what its sensors detect fits a generic target profile, so the person using it never picks the particular target or the exact moment and place of the strike. Some defensive systems, such as anti-missile guns, have long engaged incoming munitions autonomously; the concern is the spread of autonomy, enabled by computer visioncomputer vision, n.: The part of AI that lets computers make sense of images and video: recognizing faces, reading signs, spotting tumors on scans or judging how far away a car is. and AI targeting, to drones, loitering munitions and other systems that may target people. Debate centers on meaningful human control — whether people keep enough understanding, judgment and timely ability to intervene for the principles of distinction, proportionality and precaution in international humanitarian lawinternational humanitarian law, n.: The rules of international law that limit how wars may be fought, protecting civilians, the wounded and prisoners. They apply to every weapon, including ones that use AI. to be applied, and for someone to be held accountable. Most states now favor a two-tier approach: prohibit systems that cannot comply with that law and regulate the rest.
A loitering munition that chooses its own targets in a city is exactly the kind of LAWS the delegation wants banned.
Origin
'Killer robot' is older science-fiction usage. UN Special Rapporteur Christof Heyns's 2013 report spoke of 'lethal autonomous robotics', and 'lethal autonomous weapons systems' became the diplomatic term in November 2013, when parties to the Convention on Certain Conventional Weapons (CCW) agreed to hold expert meetings in Geneva from 2014. The UK NGO Article 36 is credited with introducing 'meaningful human control' in 2013, the year the Campaign to Stop Killer Robots launched.
Usage note
As of October 2026, no treaty specifically governs autonomous weapons. A CCW Group of Governmental Experts, meeting since 2017 and deciding by consensus, concluded its work on 4 September 2026 by agreeing a set of elements for a possible instrument, amid growing calls to open negotiations; the Convention's Seventh Review Conference (16–20 November 2026) is to decide next steps.
Related
- international humanitarian lawinternational humanitarian law, n.: The rules of international law that limit how wars may be fought, protecting civilians, the wounded and prisoners. They apply to every weapon, including ones that use AI.
- human-in-the-loophuman-in-the-loop, adj.: Describes AI systems in which a person checks, corrects or approves the machine's work at key points, rather than letting it act entirely on its own.
- dronedrone, n.: An aircraft that carries no one aboard to fly it: a person steers it from the ground, or its own software does. Small camera-carrying quadcopters are the most familiar kind.
- AI arms raceAI arms race, n.: A competition among countries or companies to build the most powerful AI first, in which fear of falling behind pushes everyone to move faster and cut corners on safety.
- dual-usedual-use, adj.: Describes technology or knowledge that can be used both to help and to harm: the same AI that finds software bugs for defenders can find them for attackers.
- Stuart RussellStuart Russell, prop. n.: A British computer scientist who co-wrote the standard AI textbook and argues that AI must be redesigned to stay uncertain about what humans want, so that it remains under human control.
Sources
- Heyns, C. (2013). Report of the Special Rapporteur on Extrajudicial, Summary or Arbitrary Executions (A/HRC/23/47). UN Human Rights Council.
- US Department of Defense (2023). DoD Directive 3000.09: Autonomy in Weapon Systems (updated 25 January 2023).
- International Committee of the Red Cross (2021). ICRC Position on Autonomous Weapon Systems.
Defined in law or standards
US Department of Defense Directive 3000.09, Autonomy in Weapon Systems (2012; revised 2023), Glossary ('autonomous weapon system')
Mentioned in
international humanitarian lawinternational humanitarian law, n.: The rules of international law that limit how wars may be fought, protecting civilians, the wounded and prisoners. They apply to every weapon, including ones that use AI.