For years, drone warfare has been an essentially American pursuit. The new age of armed robots has been symbolized by Predators and Reapers spewing Hellfire missiles. But guess who’s the biggest exporter of combat drones? China. “In 2014-18 China became the largest exporter in the niche market of unmanned combat aerial vehicles (UCAVs), with states in the Middle East among the main recipients,” according to the Stockholm International Peace Research Institute, which compiles estimates of global military strength and arms spending.