Cuban President Raul Castro on Thursday offered to exchange political dissidents in his country for five Cubans jailed in the US on espionage convictions. Castro also repeated his government's willingness to discuss the US embargo against Cuba with incoming President Barack Obama. Castro made his remarks referring to the "Cuban Five," who were convicted in 2001 on espionage charges and considered heroes in Cuba, after meeting with Brazilian President Luiz Inacio Lula da Silva on his first official visit outside of Cuba.