Even the USSR allied with England and the US to defeat Hitler, and the CPC allied with the KMT to defeat Japan. So what is your point here? I trust the Cuban leadership on Cuban military affairs way more than some guy with an internet connection.
This analogy doesn’t work unless you believe Cuba is currently close to being invaded. This is a geopolitical alignment, not an alliance of desperation against a genocidal threat. Cuba sees aligning with Russia as preferable to isolation, it is not gearing up for a potential war with the US.
Cuba is not facing an invasion but they are facing a strangling embargo, aligning with Russia is preferable than withering away in isolation.
There are connections to make that aren’t purpose made for anticommunism by the American state department