His unit attracts large numbers of volunteers and is largest brigade in the Ukrainian armed forces Given the bunker is easily within reach of medium-range Russian drones and jets, the caution was routine. But it takes on added drama when it emerges an alleged Ukrainian traitor, working with Russian intelligence, was recently in the area tracking the movements of Brigadier General Andrii Biletskyi.The spy’s mission was to give real-time targeting information to Russian drone pilots when Brig Gen Biletskyi was visiting a frontline location – or to find him in a command centre and send the co-ordinates to a Russian...