Cuba's President Raul Castro sits at a desk in his office in Havana in this December 16, 2014 picture provided by Estudios Revolucion. Castro hailed a landmark exchange of prisoners with the United ... more 
Cuba's President Raul Castro sits at a desk in his office in Havana in this December 16, 2014 picture provided by Estudios Revolucion. Castro hailed a landmark exchange of prisoners with the United States on Wednesday and praised U.S. President Barack Obama as the two countries agreed to normalize relations after more than five decades of hostility. Picture taken December 16, 2014. REUTERS/Estudios Revolucion/Handout via Reuters (CUBA - Tags: POLITICS) ATTENTION EDITORS - THIS PICTURE WAS PROVIDED BY A THIRD PARTY. REUTERS IS UNABLE TO INDEPENDENTLY VERIFY THE AUTHENTICITY, CONTENT, LOCATION OR DATE OF THIS IMAGE. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS less 
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Reuters | Photo By HANDOUT / REUTERS
Thu, Dec 18, 2014 11:34 AM EST