sydney australia prime minister malcolm turnbull sunday say would discuss north korea islamist terrorism threats regional stability ahead arrival east asia leaders summit philippines north korea criminal regime single large threat region turnbull tell televise news conference hong kong cunning operators say urge tighten economic sanction islamist terrorism southern philippines key security issue turnbull aim discuss philippine president rodrigo duterte manila australia say september would send troop train philippines arm force engage 154-day battle islamic state fighters southern city marawi country big security crisis decades turnbull stress importance help indonesian president joko widodo defuse islamist extremism leader world large muslim-majority country also democracy speak great authority say islam compatible democracy moderation turnbull add powerful voice moderation region australia embattle prime minister attend high-powered regional summit time citizenship crisis home destroy parliamentary majority rule center-right coalition constitution bar dual nationals parliament turnbull government throw disarray last month high court rule five parliamentarians include deputy barnaby joyce ineligible lawmakers resignation another mp saturday leave turnbull head minority government position guarantee vote two independents turnbull say expect joyce return parliament follow dec. by-election australia discuss north korea islamist terrorism manila talk