Obama's visit was aimed at consolidating a detente between the once intractable Cold War enemies, and the US president said in a speech to the Cuban people that it was time for both nations to put the past behind them and face the future "as friends and as neighbors and as family, together."

"One assumes that every one of us ran the risk of a heart attack listening to these words," Castro said in his column, dismissing Obama's comments as "honey-coated" and reminding Cubans of the many US efforts to overthrow and weaken the Communist government.

Castro, 89, laced his opinion piece with nationalist sentiment and, bristling at Obama's offer to help Cuba, said the country was able to produce the food and material riches it needed with the efforts of its people.

"We don't need the empire to give us anything," he wrote.