New York, Jan 30 (UNI) U.S. President Donald Trump on Thursday signed an executive order threatening to impose tariffs on countries that sell oil to Cuba. ET (0501 GMT) on Jan. 30, defines “oil” as crude oil or petroleum products. Trump claims that Cuba’s policies, practices and actions represent an unusual and extraordinary threat to U.S. national security and foreign policy. In a separate move on the same day, Trump threatened to impose a 50-percent tariff on all aircraft sold into the United States from Canada unless Canada “immediately” certifies business jets made by U.S. plane manufacturer Gulfstream. Trump accused Canada of wrongfully refusing to certify Gulfstream models, including the Gulfstream 500, 600, 700 and 800.