Singapore's Prime Minister Lee Hsien Loong (R) and Indonesian President Joko Widodo unveil the commemorative stamps during a Leaders' Retreat held in Singapore, on Sept. 7, 2017. Indonesian President Joko Widodo is in Singapore on a Leaders' Retreat with Singaporean Prime Minister Lee Hsien Loong, as Singapore and Indonesia mark 50 years of bilateral ties. The visit will last from Sept. 6 to Sept. 7. (Xinhua/Then Chih Wey)
