Sugar, coffee, fruit juice for babies, oil and salt inside a market subsidized by the government in Havana on July 11, 2013. Enrique De La Osa/Reuters/Landov hide caption

itoggle caption Enrique De La Osa/Reuters/Landov

Cuban President Fidel Castro (left) and Venezuelan President Hugo Chavez in Barinas, Venezuela, in 2000. The two formed a close partnership, which has continued with their successors. However, the prospect of normal ties between the U.S. and Cuba may also have an impact on relations between Cuba and Venezuela. Jose Goitia/AP hide caption

itoggle caption Jose Goitia/AP

Obama shakes hands with Castro during a memorial service for former South African President Nelson Mandela in Soweto, South Africa, on Dec. 10, 2013. Former Cuban leader Fidel Castro says his brother introduced himself to Obama in English, telling him, "Mr. President, I'm Castro," as the two leaders shook hands. AP hide caption

itoggle caption AP