ASEAN leaders shake hands on stage during the opening ceremony of the 34th ASEAN Summit at the Athenee Hotel in Bangkok, Thailand June 23, 2019. Seen here are Thai Prime Minister Prayuth Chan-ocha, chairman of 34th ASEAN Summit, Singapore's Prime Minister Lee Hsien Loong, Philippines President Rodrigo Duterte, Brunei's Sultan Hassanal Bolkiah, Cambodia's Prime Minister Hun Sen, Indonesian President Joko Widodo, Laos Prime Minister Thongloun Sisoulith, Malaysia's Prime Minister Mahathir Mohamad, Myanmar's State Counsellor Aung San Suu Kyi, and Vietnam's Prime Minister Nguyen Xuan Phuc. REUTERS/Athit Perawongmetha

Thai Prime Minister Prayut Chan O-cha delivers a speech opening the 34th ASEAN Summit in Bangkok, Thailand, Sunday, June 23, 2019. Thai Prime Minister Prayuth Chan-ocha was making his debut as a civilian leader representing current chair Thailand, after a general election in March that opposition parties say was designed to ensure his victory five years after the former army chief seized power in a 2014 coup. ANTARA/Puspa Perwitasari

ASEAN leaders react after taking a photo on stage during the opening ceremony of the 34th ASEAN Summit at the Athenee Hotel in Bangkok, Thailand June 23, 2019. Seen here are Thai Prime Minister Prayuth Chan-ocha, chairman of 34th ASEAN Summit, Singapore's Prime Minister Lee Hsien Loong, Brunei's Sultan Hassanal Bolkiah, Cambodia's Prime Minister Hun Sen, Indonesian President Joko Widodo, Laos Prime Minister Thongloun Sisoulith and Vietnam's Prime Minister Nguyen Xuan Phuc. REUTERS/Athit Perawongmetha

ASEAN leaders shake hands on stage during the opening ceremony of the 34th ASEAN Summit at the Athenee Hotel in Bangkok, Thailand, June 23, 2019. Seen here are Thai Prime Minister Prayuth Chan-ocha, chairman of 34th ASEAN Summit, Singapore's Prime Minister Lee Hsien Loong, Philippines President Rodrigo Duterte, Brunei's Sultan Hassanal Bolkiah, Cambodia's Prime Minister Hun Sen, Indonesian President Joko Widodo, Laos Prime Minister Thongloun Sisoulith, Malaysia's Prime Minister Mahathir Mohamad, Myanmar's State Counsellor Aung San Suu Kyi, and Vietnam's Prime Minister Nguyen Xuan Phuc. REUTERS/Athit Perawongmetha

ASEAN leaders shake hands on stage during the opening ceremony of the 34th ASEAN Summit at the Athenee Hotel in Bangkok, Thailand June 23, 2019. Seen here are Thai Prime Minister Prayuth Chan-ocha, chairman of 34th ASEAN Summit, Singapore's Prime Minister Lee Hsien Loong, Brunei's Sultan Hassanal Bolkiah, Cambodia's Prime Minister Hun Sen, Indonesian President Joko Widodo, Laos Prime Minister Thongloun Sisoulith and Vietnam's Prime Minister Nguyen Xuan Phuc. REUTERS/Athit Perawongmetha

ASEAN leaders shake hands on stage during the opening ceremony of the 34th ASEAN Summit at the Athenee Hotel in Bangkok, Thailand June 23, 2019. Seen here are Thai Prime Minister Prayuth Chan-ocha, chairman of 34th ASEAN Summit, Singapore's Prime Minister Lee Hsien Loong, Philippines President Rodrigo Duterte, Brunei's Sultan Hassanal Bolkiah, Cambodia's Prime Minister Hun Sen, Indonesian President Joko Widodo, Laos Prime Minister Thongloun Sisoulith, Malaysia's Prime Minister Mahathir Mohamad, Myanmar's State Counsellor Aung San Suu Kyi, and Vietnam's Prime Minister Nguyen Xuan Phuc. REUTERS/Athit Perawongmetha