After forty years of the same in Iran, the US met with similar amounts of success. Ongoing sanctions against North Korea have not toppled to regime there. 

But, some people in Washington won't let decades of failure dissuade them.

Last week, Congressman Mike Coffman (R-Colo.) introduced new legislation to bar Americans from importing oil products from Venezuela. The Washington Examiner reports: 

[T]he Protecting Against Tyranny and Responsible Imports Act, or the PATRIA Act ... would target Venezuelan President Nicolas Maduro after he stripped the country's democratically elected national assembly of its power and authority. According to the bill, the proposed ban on imports would last until the assembly's power is fully restored.