Handout picture of Cuban official website www.cubadebate.cu, showing President Raul Castro giving a speech during the opening of VII Congress of Cuban Communist Party (PCC) at Convention Palace in Havana, on April 16, 2016. President Raul Castro vowed Saturday never to pursue "privatizing formulas" or "shock therapy," setting the tone for a Communist Party congress convened to review progress in revamping the island's Soviet-style economy. / AFP / Cuba Debate / ISMAEL FRANCISCO / RESTRICTED TO EDITORIAL USE - NO MARKETING, NO ADVERTISING CAMPAIGNS - MANDATORY CREDIT: AFP PHOTO/CUBA DEBATE/ISMAEL FRANCISCO - DISTRIBUTED AS A SERVICE TO CLIENTS - XGTY (Photo credit should read ISMAEL FRANCISCO/AFP/Getty Images)