Castro gave copies of his two-volume memoirs to Brazilian President Dilma Rousseff during her visit to Cuba this week, according to diplomatic sources in Brazil.

The memoirs are published by Editora Abril and illustrated with photographs and drawings by the Cuban painter Ernesto Rancano.

Castro spoke about international politics during his presentation at the Palace of Conventions.

He said he closely follows events in Venezuela under the government of his friend, Hugo Chavez.

"No one did more for the people of Venezuela, the Bolivarian Movement," he said.

He also referred to the Chilean student protests demanding free and quality education under the guidance of their leader Camila Vallejo.

"We should support the ideas of the young Chilean in the sense of fighting for education available equally to all," Castro said. "It shouldn't be just general education and free, but we should also worry about what is taught," he added.

Regarding the politics of Latin America and the Middle East, Castro said, "There is no longer room only for national interests. Instead, they should be framed under world interests."

"Our duty is to fight until the last minute for our country, for our planet and for humanity."

Castro also congratulated the families of five Cuban agents convicted of espionage in the United States. The Cuban government refers to them as "heroes" and "anti-terrorists" for their work in monitoring anti-Castro groups in Miami.

"You have to see what these men have endured," he said.