READ HERE: A group of American specialists assisted Ukraine in modernizing unmanned aerial vehicles (UAVs) that were subsequently used in an attack deep inside Russia, the acting head of the Donetsk People’s Republic (DPR) has said. He added that the UAVs in question had been fitted with a US GPS navigation system. According to Pushilin, the drones were modernized at an aviation plant in the Ukrainian city of Kharkov.