U.S. President Barack Obama smiles as he chats with Vietnam's Prime Minister Nguyen Xuan Phuc during the ASEAN Summit gala dinner in Vientiane

U.S. President Barack Obama smiles as he chats with Vietnam’s Prime Minister Nguyen Xuan Phuc during the ASEAN Summit gala dinner in Vientiane

U.S. President Barack Obama smiles as he chats with Vietnam's Prime Minister Nguyen Xuan Phuc during the ASEAN Summit gala dinner in Vientiane, Laos September 7, 2016. REUTERS/Jonathan Ernst - RTX2OIKJ

May 30, 2017 6:08 PM (UTC+8)