In this Aug.18, 1999 file photo, Cuba's leader Fidel Castro gestures at a speaking event as he explains that he does not understand why he is not blind after all the camera flashes he has received in Havana, Cuba. Former President Fidel Castro, who led a rebel army to improbable victory in Cuba, embraced Soviet-style communism and defied the power of 10 U.S. presidents during his half century rule, has died at age 90. AP/Jose Goitia, File

The Cuban President Fidel Castro glances over his shoulder during the May Day commemoration at Revolution Square in Havana, in this May 1, 2004 file photo. Fidel Castro, the Cuban revolutionary leader who built a communist state on the doorstep of the United States and for five decades defied U.S. efforts to topple him, died on Friday, his younger brother announced to the nation. He was 90. REUTERS/Rafael Perez/Files

In this Feb. 3, 2006 file photo, Cuba's leader Fidel Castro speaks in Havana, Cuba. Former President Fidel Castro, who led a rebel army to improbable victory in Cuba, embraced Soviet-style communism and defied the power of 10 U.S. presidents during his half century rule, has died at age 90. The bearded revolutionary, who survived a crippling U.S. trade embargo as well as dozens, possibly hundreds, of assassination plots, died eight years after ill health forced him to formally hand power over to his younger brother Raul, who announced his death late Friday, Nov. 25, 2016, on state television. AP/Javier Galeano, File

Cuba's President Fidel Castro looks at the crowd during a mass rally in Cordoba, Argentina July 21, 2006. A towering figure of the second half of the 20th Century, Castro stayed true to his ideology beyond the collapse of Soviet communism, and retained an aura in parts of the world that had struggled against colonial rule and exploitation. REUTERS/Andres Stapff/File Photo

Cuban President Fidel Castro listens to a speaker during the May Day parade in Havana's Revolution Square in this May 1, 2005 file photo. Former President Fidel Castro, who led a rebel army to improbable victory in Cuba, embraced Soviet-style communism and defied the power of 10 U.S. presidents during his half century rule, has died at age 90. REUTERS/Claudia Daut/File Photo

The Cuban President Fidel Castro laughs during the year-end session of the Cuban parliament in Havana in this December 23, 2005 file photo. Fidel Castro, the Cuban revolutionary leader who built a communist state on the doorstep of the United States and for five decades defied U.S. efforts to topple him, died on Friday, his younger brother announced to the nation. He was 90. REUTERS/Claudia Daut/File Photo