Olexi Kroshchenko, a clean-cut Ukrainian helicopter pilot, stood elbow-to-elbow with Chase Bailey, a bearded Las Vegas hipster, and learned how to fly drones in war zones.
Within days, Kroshchenko hoped, some of the 10 specialized quadcopters donated by an American manufacturer would be angling into the treacherous gaps of bombed-out apartments and high-rises, giving Ukrainian rescuers a better chance to reach victims.
