Comment by craftkiller

https://en.wikipedia.org/wiki/United_States_embargo_against_...

> companies that do business with the U.S. which trade in Cuba do so at the risk of U.S. sanctions. The U.S. has threatened to stop financial aid to other countries if they trade non-food items with Cuba.

> The U.S. government has pursued extraterritorial measures to enforce its embargo. Cuban ambassador Ricardo Alarcón cited 27 recent cases of trade contracts interrupted by U.S. pressure to the U.N. in 1991. British Petroleum was seemingly dissuaded by U.S. authorities from investing in offshore oil exploration in Cuba despite initially expressing interest. In 1992, the U.S. State Department discouraged firms like Royal Dutch Shell and Clyde Petroleum from investing in Cuba.