Cuban Foreign Minister Bruno Rodríguez condemned the executive order, calling it a “brutal act of aggression against Cuba and its people.”

Donald 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 Mexican President Claudia Sheinbaum has sought to build a strong relationship with Trump.

In its deepening energy and economic crisis, fueled in part by strict economic sanctions by the U.S., Cuba had relied heavily on foreign assistance and oil shipments from allies like Mexico, Russia and Venezuela before a U.S. military operation ousted former Venezuelan President Nicolás Maduro.

Since the Venezuela operation, Trump has said no more Venezuelan oil will go to Cuba and that the Cuban government is ready to fall.