What unilateral action? Bombing pipelines? In the territory of another nuclear power? And given that China is rapidly building pipelines to Russia, what other consequences could this sort of action have? How would the EU react to a US stance of this kind?POTUS has drawn another red line. China must cut ALL oil exports to NK OR ELSE the US will take unilateral action to deny them the oil.
He continues to paint himself into a corner with potentially disastrous outcomes.
Think it through. Context matters. Actions have consequences beyond the intended, even if the intended goals are achieved.