President Trump on Thursday signed an executive order that would impose a tariff on any goods from countries that sell or provide oil to Cuba, a move that could further cripple an island plagued by a deepening energy crisis. The order would primarily put pressure on Mexico , a government that has acted as an oil lifeline for Cuba and has constantly voiced solidarity for the U.S. adversary, even as President Claudia Sheinbaum has sought to build a strong relationship with Mr. Trump. This week