Communist Cuba is running out of fuel, and with it, time.

This regime, just 90 miles south of the Florida Keys, has defied American pressure for 67 years. It has survived the Bay of Pigs invasion, the Cuban Missile Crisis, and the collapse of the Soviet Union. But its present crisis may be too great to withstand.

Already under great economic pressure, Cuba’s situation has worsened greatly since the United States seized Venezuelan dictator Nicolás Maduro in Caracas last month. Venezuela had supplied Havana with heavily subsidized oil for decades, but that lifeline is now severed.

When President Donald Trump signed an executive order threatening tariffs on any nation that ships oil to Cuba, the remaining options narrowed further. Mexico, which had quietly overtaken Venezuela as Cuba’s main supplier, has buckled under the pressure, withholding a planned shipment.

The Cuban communists have a problem. Inflation is soaring. Extreme poverty affects the vast majority of the population. Food and medical........

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