HAVANA, CUBA - JUNE 23:  Juan Manuel Santos president of Colombia (L) and Timoleon Jimenez 'Timonchenko' shake hands (R) shake hands during a ceremony to sign a historic ceasefire agreement between Colombian Government and the FARC rebels to end a 50-year conflict on June 23, 2016 in Havana, Cuba. Several Latin American leaders were present to mark the end of the last major conflict on the continent.  (Photo by Ernesto Mastrascusa/LatinContent/Getty Images)