Fidel Castro is celebrating his 89th birthday with a newspaper column repeating assertions that the U.S. owes socialist Cuba "numerous millions of dollars" for damages caused by a decades-long embargo.

The essay comes a day before an historic moment in U.S.-Cuba relations: Secretary of State John Kerry is to raise the Stars and Stripes over a restored American Embassy in Havana, though the economic embargo legally remains in effect.

The rapprochement after 54 years of formal diplomatic estrangement was engineered by Fidel's brother Raul, who took over Cuba's presidency after the elder Castro suffered a health crisis in 2006.

Thursday's says Cuba "will never stop fighting for peace and the well-being of all human beings."