Benedict has it right on this. The US Trade Embargo may have been useful before the utter defeat of Communism in all but a few miserable little places like Cuba and a miserable big place like China, but it is counter-productive now.
The US should tell the Cuban government that in return for removal of the embargo we want completely free movement between the two countries and the right of return for Cuban-Americans and their descendents.
Under those conditions communism will not last long in Cuba. pl