The US was still waiting Wednesday for a formal response from Russia on a draft document laying out proposed technical safety procedures for the aircraft flights, said a senior U.S. defense official, speaking on condition of anonymity because the official wasn't authorized to discuss the situation publicly. [...] Russian Deputy Defense Minister Anatoly Antonov said the talks should be much broader and also cover potential international cooperation between Russia and the U.S.-led coalition fighting the Islamic State group. [...] the U.S.