And good luck with that blockade. Countries that don't waste decades enforcing known-defective economic systems are hard to defeat with tactics like that. They tend to have the necessary productive capacity to support a strong military.
Because a country needs lots of different resources and enough people to be self-sufficient at the current level of technology, I would think almost all smaller countries can be blockaded into the mid-twentieth, if not the nineteenth century, no matter what their political system, if the blockade is held up long enough.
I can’t see countries the size and population of Belgium or Peru making modern cars _and_ modern phones _and_ modern clothing _and_ modern farming tech _and_ plastic _and_ (etc) after an effective decades-long blockade, for example.
However, when that same topic is kicked off with "the people of an enemy state are struggling" they act as if they were nothing but concerned, compassionate humanitarians. The wording of the message changes, but the intent does not. The desired result is still intervention without consequences.
The kayfabe works very well too, so why would they stop.
I’d think this is unlikely to ever happen since the US is a lucrative market to export to.