On the day John F Kennedy died, the CIA was working to kill Fidel Castro with a poisoned pen.
Mr Kennedy was assassinated in Dallas in 1963, but Mr Castro survived a CIA plot to kill him with a lethal ballpoint pen. In the end, the Cuban leader outlasted his American rival by more than five decades.
The machinations against Cuba’s communist leader are revealed in a new batch of declassified documents relating to Mr Kennedy’s assassination. The National Archives has been steadily making thousands of documents available to the public, helping to illuminate both the government’s scramble to investigate the President’s death and the Cold War geopolitics playing out around them.