Raúl Castro

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FILE - In this Monday, March 21, 2016, file photo, Cuban President Raul Castro, right, lifts up the arm of President Barack Obama at the conclusion of their joint news conference at the Palace of the Revolution in Havana, Cuba. One of Cuba’s most renowned advocates of economic reform has been fired from his University of Havana think tank, on Wednesday, April 20, for sharing information with Americans without authorization, among other alleged violations.(AP Photo/Ramon Espinosa, File)

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President Obama and his Cuban counterpart Raul Castro wave to fans before taking their seats at Tuesday's exhibition game between the Tampa Bay Rays and the Cuban national team. Castro stayed for two innings while Obama left after three.

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FILE - In this April 11, 2015, file photo, US President Barack Obama, right, smiles as he looks over towards Cuban President Raul Castro, left, during their meeting at the Summit of the Americas in Panama City, Panama. On Decmeber 17, 2014, Presidents Barack Obama and Raul Castro stunned the world by announcing an end to their nations’ half-century of official hostility. (AP Photo/Pablo Martinez Monsivais, File)

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Cuba's President Raul Castro pauses as he speaks to reporters on the tarmac of the Jose Marti airport after escorting France's President Francois Hollande to his plane in Havana, Cuba, Tuesday, May 12, 2015. Castro said Cuba and the U.S. will name ambassadors to each other’s countries as soon as the island is removed from the U.S. list of state sponsors of terrorism later this month. (AP Photo/Desmond Boylan)

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Pope Francis meets Cuban President Raul Castro during a private audience at the Vatican, Sunday, May 10, 2015. Cuban President Raul Castro has been welcomed at the Vatican by Pope Francis, who played a key role in the breakthrough between Washington and Havana aimed at restoring U.S.-Cuban diplomatic ties. (AP Photo/Gregorio Borgia, Pool)

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This image from the host broadcaster pool video shows U.S. President Barack Obama and Cuban President Raul Castro exchange handshakes on Friday April 10, 2015, at the opening of the Summit of the Americas in Panama. (AP Photo/Host Broadcaster Pool Video via AP Video)

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President Obama's warming relations with Cuban President Raul Castro have drawn fire from political opponents, namely Sen. Marco Rubio, Florida Republican and a Cuban-American, who says Mr. Obama's embracing Mr. Castro sends "the wrong kind of message." (Associated Press) ** FILE **

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FILE - In this Dec. 20, 2014 file photo, Cuba's President Raul Castro points to the press during the closing of the legislative session at the National Assembly in Havana, Cuba. Castro told a summit of the Community of Latin American and Caribbean States meeting in San Jose, Costa Rica, Wednesday, Jan. 28, 2015, that the United States needs to return the U.S. base at Guantanamo Bay, lift the half-century trade embargo on Cuba and compensate his country for damages before the two nations re-establish normal relations. (AP Photo/Ramon Espinosa, File)

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Cuban President Raul Castro has warned that dissidents in his country may try to undermine the recent announcement of relations with the U.S. (Associated Press)

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Russia's President Vladimir Putin (behind) and Cuba's President Raul Castro attend a ceremony at the Mausoleum of the Soviet Internationalist Soldier in Havana in July during Mr. Putin's Latin American tour aimed at boosting trade and ties in the region. (Associated Press)

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President Barack Obama talks with President Raúl Castro of Cuba from the Oval Office, Dec. 16, 2014. (Official White House Photo by Pete Souza)

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In this Tuesday Dec. 10, 2013, file photo, U.S. President Barack Obama shakes hands with Cuban President Raul Castro, as it rains during a memorial service for former South African President Nelson Mandela, at the FNB Stadium in Soweto, South Africa. (AP Photo/File) ** FILE **