Donald Trump signed an executive order on Thursday laying the groundwork to slap tariffs on goods from countries that provide oil to Cuba, the White House said. The White House has yet to specify tariff rates for violating its new policy of blocking Cuba from buying oil. A White House statement cited Cuba’s ties to hostile powers to explain the new tariff policy, citing the Cuban government’s alleged ties to Russia, Hamas and Hezbollah. The Trump administration had pressured other countries to stop providing oil to Cuba in the lead-up to Thursday’s tariff announcement. Under US pressure, Cuba lost access to Venezuelan oil, its principal supplier.