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Fidel Castro

An argument between the U.S. and Venezuela is putting Cuba in an awkward position

President Barack Obama's attempt to mend relations with Cuba while simultaneously turning the screws on Venezuela, Havana's closest ally, is making for some fascinating triangular diplomacy.

Late Monday night, after Venezuelan President Nicolás Maduro gave a speech blasting new U.S. sanctions on his administration as an attempt to overthrow him, the Cuban government affirmed its "unconditional support" for Maduro.

Then 88-year-old Fidel Castro chimed in for good measure.

"Dear Nicolás Maduro," Castro wrote in a brief message published by Cuban state media that was almost tight enough for a Twitter posting. "I congratulate you for...