Let me propose a hypothetical.
When Obama opened the connections with Cuba, the country had been suffering economically for the last 60 years. They were hungry for relief from the economic constraints and presuures imposed upon them by the US in response to Fidel Castro.
If we had allowed the normal flow of goods into the country to continue, and Trump had not shut off the economic spigot, the Cuban people would have become willing capitalists. They were that hungry for new goods and services. Raul Castro is not his brother and was much more pliable. Once the govrrnment of Cuba has tasted the influx of new goods it would have nearly impossible for
Raul or any leader to reverse the capitalistic trend.
Now here's the real hypothetical. Cuba and Russia are the two countries propping up Maduro in Venezuela. Is Cuba engaging in Venezuela 's internal concerns in response to Trump's reversing their opening just after they had a taste of economic relief and hope. Is Raul possibly motivated by Trump's precipitous actions?
Had we kept them open and fed them the goods they so desparately desired and would be enjoying, they would have thought twice about involving themselves in Venezuela for fear of having that spigot shut off by the US.
Had Cuba not gotten involved due to this fear of sanction would Russia have hesitated in getting involved. Would Russia not have been encouraged to ignore the Monroe Doctrine? If so, would not Maduro's government not already have collasped?
The implications of this hypothetical suggests that Trump's lack of foreign policy acumen and his refusal to listen to those around him who do have the knowledge and acumen has created an unnecessary situation. He lost his opportunity to make Cuba a capitalist or quasi-capitalist country and an ally (albeit reluctant, but economically dependent). Would this then not have headed off Russia incursion into Venezuela, with Russia seeing too high a risk without a partner in the hemisphere (Cuba)?.