Cuban revolutionary leader Fidel Castro revived old enmities with the United States as he celebrated his 90th birthday on Saturday, skewering Havana’s Cold War foe for its repeated attempts on his life.

Castro criticised U.S. President Barack Obama for failing to explicitly apologise during his historic visit to Japan in May for Washington’s decision to drop the atomic bomb. He also recalled his own youth and confrontation with the U.S. while he headed Cuba. “I almost laughed at the Machiavellian plans of U.S. Presidents,” Castro said in the article published late on Friday.

According to Cuban intelligence services, Castro faced about 634 plots between 1958 and 2000. Several of those have been substantiated by U.S. officials; some reportedly involved slipping poisoned or explosive cigars to the cigar-loving Cuban leader.