1960: US and British Firms Violate Oil Refining Agreement in Cuba
US and British firms refuse to continue refining Cuban oil: "When the first shipload of crude oil arrives from the Soviet lJnion, the Shell, Esso and Texaco refineries (the former a British company, the others U.S. firms) refuse to refine it"
Source: Escalante (1995), The Secret War: CIA Covert Operations Against Cuba, 1959-1962. Ocean Press, p. 162