Simple fact of the matter is North Korea exists because China exists. China is the only nation substantially supporting its non existent economy. Just issue an executive order that any nation trading with North Korea will immediately be precluded from trading with the US until the trade ceases, That means you China.
The US does not need to keep China open for trade. India is ready and willing to step in and satisfy all of China’s resources with the added bonus it is a democracy.
“Just issue an executive order that any nation trading with North Korea will immediately be precluded from trading with the US until the trade ceases, That means you China.”
You do realize that the US has put itself into a trade position with China where that has only the most infinitesimal chance outside of war between the US and China of ever happening?