It's strange - if we're so confident that our ideology is superior then wouldn't we welcome a small neighbor on our doorstep trying something different as a sort of experiment expected to reaffirm our views? Celebrate them the way you might a silly child, occasionally support them, all while pointing to them as an example of why we don't do what they're doing.
That was an awful long time ago and doesn't reflect the current situation.
> Cube prevents its citizens from leaving.
What's your point? If they suddenly changed that policy do you believe we would immediately walk back the sanctions and the oil blockade? That isn't how it looks to me.
The only way I can think to interpret current US policy is either one of petty insecurity or else an attempt at coercive commercial exploitation.
Unless of course we fear they might succeed.