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.
It's not a paradise if the citizens are blocked from leaving it.
Nobody is blocked from leaving the US.