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In these handout photos released by Cuban official website www.cubadebate.cu on March 27, former Cuban President Fidel Castro is shown with during a visit by Vietnamese Prime Minister Nguyen Tan Dung on March 26, 2014 in Havana. Tan Dung is in Cuba in a three-day official visit.

Handout picture released by Cuban official website www.cubadebate.cu on March 27, 2014 showing Vietnamese Prime Minister Nguyen Tan Dung (C) holding a meeting with Cuban former President Fidel Castro (R), on March 26, in Havana. Tan Dung is in Cuba in a three-day official visit. AF-- / AFP - Getty Images