On Tuesday and Wednesday, Cubana de Aviacion flights to Buenos Aires were canceled because fuel suppliers in Argentina refused to serve the airline.
The companies have invoked "provisions of the United States blockade against Cuba" to not supply the aircraft of the Cuban state airline.
Additionally, this measure has affected other airlines contracted by Cubana de Aviacion, preventing them from fulfilling commitments to passengers.
This surprising decision took place despite the Cuban flights being approved by the Argentina's National Civil Aviation Administration (ANAC).
In response to this situation, the airline has decided to assist affected passengers in Cuba by sending them back on flights operated by other airlines connecting to Argentina. Other passengers will be eligible for a full refund of their airfare.
⠀
During the first quarter of 2024, the Cuban airline transported 3,221 passengers with an occupancy rate of 61 percent. The number of Argentine travelers to Cuba increased by 44 percent compared to the same period last year, reaching 12,753 people.
Well Castro came to power via revolution in 1959, which pissed off the US, and started the push towards the Soviet Union. The nation also hosted Soviet nukes for a very brief time in 1962.
More detailed timeline found here, if you're interested.