The Swiss held the money for North Korea for decades and the sanctions were the result of a decision of the UN security council last but not least North Korea isn't entirely closed off from the financial system like Russia is at the moment. Everyone knows China along with other countries are laundering money for North Korea no one is threatening China openly because of it.
Yes, we are. I fail to see that the distinction matters at all in context.
This just seems like a failure on your part to understand the realistic consequences of diplomatic actions. Instead, you'd rather think, what, the only reason it hasn't been done before is that... it hasn't been done before?
"The difference between stupidity
and genius is that genius has its limits."
--Alexandre Dumas-fils
Feel free to elaborate on nuance and context that I am missing because there's no reason for other countries watching this not to be frightened.
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Agreed that is a fair take, it has a better chance now though. China has been struggling to establish a separate financial system though it may take years if not decades they will give it their best shot.
"The difference between stupidity
and genius is that genius has its limits."
--Alexandre Dumas-fils
"Truth...justice, honor, freedom! Vain indulgences, every one(...) I know what I want, and I take it. I take advantage of whatever I can, and discard that which I cannot. There is no room for sentiment or guilt."
Other countries aren't blatantly invading their neighbors in transparent bids for conquest and committing war crimes while doing so, so yeah, I'd say there's a huge fucking reason for other countries not to be worried because of THAT context that you are somehow completely ignoring.