Meet the amateur drone pilots defending Ukraine's border with Russia

Students, academics and electronics hobbyists are using homemade drones and motion-sensing cameras to patrol the Ukrainian border for signs of Russian military build-up and aggression. They say they have also struck at Russian targets with adapted Soviet missiles. The intelligence this group gathers is fed into a custom software package that it helped develop for the country's military. Aerorozvidka is an non-governmental organisation staffed by dozens of software and hardware engineers.