HAVANA, June 23, 2016 (Xinhua) -- Colombian President Juan Manuel Santos (3rd-L, back) and Timoleon Jimenez (2nd-R, back), the top leader of the Revolutionary Armed Forces of Colombia (FARC), sign a pact in Havana, capital of Cuba, June 23, 2016. The Colombian government and the FARC guerrilla group signed a pact on a definitive bilateral ceasefire, marking a major step towards ending a half-century conflict. The conflict had killed more than 220,000 people and displaced millions since 1964. (Xinhua/Liu Bin)