United Nations Secretary-General Ban Ki-moon speaks next to a memorial photo of Lee Kuan Yew, Singapore's first prime minister, at the Mission of Singapore in New York March 23, 2015. REUTERS/Evan Schneider/United Nations/Handout FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS THIS IMAGE HAS BEEN SUPPLIED BY A THIRD PARTY. IT IS DISTRIBUTED, EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS