Armed UAVs were exported for the first time in 2007, when USA delivered two MQ-9 Reapers to the UK. The MQ-9 was used by the UK forces in Afghanistan.
China became the second-largest exporter of armed UAVs in 2014, when it delivered five drones to Nigeria, which deployed UAVs against Boko Haram, a terrorist outfit.
Drone attacks have been criticised around the world for accidentally killing civilians while hunting suspected terrorists.