(From left) Thai Prime Minister General Prayuth Chan-ocha, Vietnamese Prime Minister Nguyen Xuan Phuc, US President Barack Obama, Laotian Prime Minister Thongloun Sisoulith, Philippine foreign minister Perfecto Yasay and Brunei's Sultan Hassanal Bolkiah stand on the stage for group photographs during the US-Asean Summit in Vientiane, Laos, in September. Photo: AFP