Trump threatens tariffs on nations selling oil to Cuba, escalating pressure on Mexico President Trump has signed an order targeting countries that supply oil to Cuba, a step that raises fresh pressure on Mexico. Washington:US President Donald Trump on Thursday signed an executive order proposing tariffs on goods from any country that sells or supplies oil to Cuba. Earlier this week, Mexican President Claudia Sheinbaum confirmed that her government had paused oil shipments to Cuba, at least for the time being. The island has usually relied on oil shipments from Mexico, Russia and earlier from Venezuela. Recent cooperation with the USEven as tensions simmer over Cuba, Mexico has cooperated with the United States on other fronts.