The historic thaw between the old Cold War enemies was announced on 17 December, in joint media conferences by Presidents Barack Obama and Raul Castro.
There was no immediate comment from Fidel Castro, and analysts said the rapprochement would not have happened if he was still in power.
Just over a month later, he broke his silence in a letter published on the Cuban Communist Party newspaper, Granma.
"I don't trust the policy of the United States… but this does not mean I reject a pacific solution to the conflicts," he wrote.
Relations had been frozen since the early 1960s when the US broke links and imposed a trade embargo on Cuba.
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