Photo by: Apichart Weerawong

Three national leaders attending the Association of Southeast Asian Nations summit — (from left) Laotian Prime Minister Thongsing Thammavong, Malaysian Prime Minister Najib Razak and Myanmar President Thein Sein — join hands during a group photo at the opening ceremony of the bloc's 20th summit in Phnom Penh, Cambodia, on Tuesday, April 3, 2012. (AP Photo/Apichart Weerawong)