Prime Minister of Thailand Prayut Chan-o-cha arrives for the sixth Mekong Greater Sub-Region Summit (GMS-6) in the National Convention Center (NCC) in Hanoi, Vietnam

Prime Minister of Thailand Prayut Chan-o-cha arrives for the sixth Mekong Greater Sub-Region Summit (GMS-6) in the National Convention Center (NCC) in Hanoi, Vietnam

Prime Minister of Thailand Prayut Chan-o-cha arrives for the sixth Mekong Greater Sub-Region Summit (GMS-6) in the National Convention Center (NCC) in Hanoi, Vietnam March 31, 2018. Minh Hoang/Pool via REUTERS

April 4, 2018 5:03 PM (UTC+8)