Cuba’s desperate wait for fuel seems to have just gotten longer. A Russian tanker that had appeared headed to Cuba — with 242,000 barrels of badly needed diesel — has turned away from the island and now appears to be on its way to South America. The diversion is a brutal development for the Cuban government and its people, who have been enduring a worsening energy crisis since the Trump administration imposed an effective oil blockade against the island in January. Russia has so far been the