A drone in action. Kypros/Getty Images More than a half dozen US drone startups have donated or sold equipment to Ukraine , WSJ reported. Ukrainian officials questioned whether Chinese alternatives had impeded military defences, per WSJ. Advertisement Brinc Drones and Skydio, two US-based firms, have been donating or selling scores of drones to Ukraine, a report says. The companies stepped up after Ukrainian officials raise concerns that the Chinese drone maker DJI may have intentionally created "technical glitches" in its products to impair Ukraine's defence , according to a WSJ report . DJI has denied these claims, the outlet added….