HAVANA, June 23, 2016 (Xinhua) -- Image taken on June 23, 2016 provided by the United Nations shows the UN Secretary-General Ban Ki-moon (L) shaking hands with Timoleon Jimenez (R-front), the top leader of the Revolutionary Armed Forces of Colombia (FARC), prior to the signing ceremony of a historic ceasefire agreement between the Colombian government and FARC, in Havana, capital of Cuba, on June 23, 2016. (Xinhua/UN Photo/Eskinder Debebe)