Southeast Asian nations step up cooperation as Islamic State threat mounts

By Kanupriya Kapoor and Fathin UngkuSINGAPORE (Reuters) - Southeast Asian nations plan to use spy planes and drones to stem the movement of militants across their porous borders, defense officials said at the weekend, as concerns rise over the growing clout of Islamic State in the region.Indonesia, Malaysia and the Philippines said they will launch joint air patrols this month at their shared boundaries in the Sulu Sea, in addition to existing maritime patrols.Authorities in the region have urge