Vietnam's President Truong Tan Sang (C) walks past leaders at the opening ceremony of the 12th National Congress of Vietnam's Communist Party in Hanoi, Vietnam, January 21, 2016. People on the photo are: Communist Party Chief Nguyen Phu Trong (L, bottom), Ho Chi Minh City's Party Chief Le Thanh Hai (top, L), Hanoi City's Party Chief Pham Quang Nghi (C, top), Defence Minister Phung Quang Thanh (R, top) and Prime Minister Nguyen Tan Dung (R, bottom). REUTERS/Kham