Seoul

SOUTH Korean President Moon Jae-in's top security aide left for Washington on Thursday as the new leader tries to reassure his country's main ally he will not scrap a deal to host a missile defence system that has angered China.

Mr Moon ordered an investigation this week into why his office had not been informed about the deployment of four more launchers for the US Terminal High Altitude Area Defense (Thaad) system, which are being deployed amid a growing threat of missile launches by North Korea.