The war in Ukraine has seen a proliferation of aerial drones for both surveillance and combat.
The military advantages of these relatively cheap systems are obvious - especially for a force taking on a more conventionally powerful foe - and there is nothing so useful to a soldier as knowing what lies over a hill.
But does the increasing sophistication of the technology point to a future in which artificial intelligence and autonomous weapons also become commonplace? And if that happens - what ethical questions might it raise?
For People and Power, filmmakers William Davies and Rory Challands went to find out.
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