Has not trading with "evil" regimes done any good? 50 years later, Cuba still exists, and so does North Korea...

Was that because of trade sanctions, or because the regimes were (internally) unsustainable? (Honest question, I'm not old enough to know.)

The first US Sanctions against South Africa took into effect in 1986, 5 years later the Apartheid system was ended.

See e.g. https://en.wikipedia.org/wiki/Comprehensive_Anti-Apartheid_A...

US certainly did not show any shyness in doing exactly that. http://www.derechos.org/soa/

Training manual for the school of the Americas http://www.soaw.org/docs/SOA%20Manejo%20de%20Fuentes%201-60....

https://www.nytimes.com/1996/09/28/opinion/school-of-the-dic...

I understand that dictatorship != fascism.