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Montenegro's President Filip Vujanovic  (2nd L) and his wife Svetlana  (L) greet Chinese President Xi Jinping as his wife Peng Liyuan looks on during a reception for country leaders and officials at the Purple Palace, ahead of the 2014 Nanjing Youth Olympic Games opening ceremony, in Nanjing

United Nations Secretary-General Ban Ki-moon (L) and Chinese President Xi Jinping (R) face the media during a ceremonial handshake before a meeting at the Purple Palace in Nanjing, August 16, 2014. Ban and Xi are expected to attend the opening ceremonies of the Nanjing 2014 Youth Olympic Games

International Olympic Committee (IOC) President Thomas Bach (front 2nd L) and Chinese President Xi Jinping (front 2nd R) look at each other as their respective wives Claudia Bach (front L) and Peng Liyuan stand beside them during a group photo with IOC officials at the Purple Palace, ahead of the 2014 Nanjing Youth Olympic Games opening ceremony, in Nanjing

Chinese President Xi Jinping (R) greets members of the Maldivian delegation as Maldives' President Abdulla Yameen (2nd R) watches on before a meeting at the Purple Palace in Nanjing August 16, 2014. Yameen and Xi are expected to attend the opening ceremonies of the Nanjing 2014 Youth Olympic Games