Mexico, Cuba's top oil supplier after Venezuela, cut off shipments to Havana in December. (AP PHOTO)Mexico, Cuba's top oil supplier after Venezuela, cut off shipments to Havana in December. (AP PHOTO) Credit: AAPUS President Donald Trump has threatened new ‍tariffs on countries supplying oil to Cuba, escalating a pressure campaign against the ​Communist-run island and long-time foe of the United States. Trump said this week that "Cuba will be failing ​pretty soon," adding that Venezuela, once the island's top oil supplier, has not ‍recently sent oil or money to Cuba. Cuba's president, Miguel Diaz-Canel, said this month that Washington had no moral authority to force a deal on Cuba after Trump suggested the Communist-run island should strike an agreement with the US.