“I want you to know that we are standing firm, with our hearts full of your love,” he added.
In the two photographs, Maduro is wearing a gray tracksuit and making peace signs with his hands. He appears to have lost considerable weight since his capture.
Although the photographs emerged Sunday, camera data indicates they were taken on 25 June, a day after twin deadly earthquakes killed more than 6,500 people and caused widespread destruction in northern Venezuela.
“We will remain strong, calm and confident: God is with us. God will provide. Venezuela will rise again,” he concluded.
The authenticity of the photos could not be verified by Agence France-Presse (AFP).
AFP attempted to contact the detention center to find out if the photos were authentic and had been authorized, but did not receive a response immediately.
The message was posted two days after his successor, interim President Delcy Rodriguez, announced a “historic” oil agreement allowing the US to operate oil fields in Venezuela.
Rodriguez is governing under intense pressure from Washington and says she has “chosen the path of diplomacy” with the US because she wants Venezuela to become an “energy powerhouse.”
Maduro does not have access to newspapers or the internet in prison, but he is allowed to speak by telephone with his family and lawyers for approximately 300 minutes a month, with a maximum of 15 minutes per call, according to a source close to the former leader.
His son, Nicolas Maduro Guerra, says his father is in good shape and spends his time studying the Bible.
Maduro and his wife’s trial in the US will begin on 1 June 2027, a federal court in New York announced in late July.