To my knowledge China has a grand total of 0 warships in the Atlantic. That's not a serious concern for military strategy.
As for Cuba, they have done literally nothing other than suffer under a blockade for longer than most people have been alive. Let them trade and see if they can beat the Soviet Union, because that's what did them in. Being a tyrant yourself because you want to wank off military tech is definitely not the answer.
Havana syndrome - Wikipedia
en.wikipedia.org
They attacked US diplomatic staff just like Iran.
Edit: Regarding China...
China’s Growing Influence in Latin America | Council on Foreign Relations
For more than two decades, China has developed close economic and security ties with many Latin American countries, including Brazil, Peru, and Venezuela. But Beijing’s increasing sway in the region continues to raise concerns in Washington, prompting greater U.S. engagement.

