Washington : US President Donald Trump on Thursday signed an executive order warning of fresh tariffs against countries supplying oil to Cuba, stepping up economic pressure on the communist island nation. Amid this escalating pressure, Mexico has temporarily suspended oil shipments to Cuba, Al Jazeera reported, as Trump seeks to further isolate Havana. Trump has since hardened his stance toward Havana, writing on Truth Social on January 11: "THERE WILL BE NO MORE OIL OR MONEY GOING TO CUBA - ZERO! As tensions mount, Al Jazeera reported that a Cuban diplomat in Bogota accused Washington of "international piracy" over efforts to block Venezuelan oil shipments. Al Jazeera reported that Cuba is now facing its worst economic crisis since 1959, driven by fuel shortages, power cuts and disruptions to food and water supplies.