In this Tuesday, Sept. 6, 2016, file photo, Southeast Asian leaders link arms at the opening of the 28th and 29th ASEAN Summits and other related summits in the National Convention Center in Vientiane, Laos. Leaders are, from left; Malaysia's Prime Minister Najib Razak, Myanmar's State Counsellor and Foreign Minister Aung San Suu Kyi, Singapore's Prime Minister Lee Hsien Loong, Thailand's Prime Minister Prayuth Chan-ocha, Vietnam's President Tran Dai Quang, Laos' President Bounnhang Vorachith, Laos' Prime Minister Thongloun Sisoulith, Philippine President Rodrigo Duterte, Brunei's Sultan Hassanal Bolkiah, Cambodia's Prime Minister Hun Sen and Indonesia's President Joko Widodo. (AP Photo/Bullit Marquez, File)