This is how tyrants behave. You offer them a handshake and they try to tear your arm off.
Castro wrote: “Cuba is owed compensation equivalent to damages, which total many millions of dollars, as our country has stated with irrefutable arguments and data in all of its speeches at the United Nations.”
He did not go into detail about precisely how much money he reckons Washington owes Havana. The Americans are also claiming compensation for US-owned property, such as real estate, that was confiscated when Castro took power.
I would argue that, if anything, Castro owes the U.S billions for the private American property he confiscated when he came to power.