In an unexpectedly strong diplomatic escalation, one day after China agreed to vote alongside the US (and Russia) during Monday's United National Security Council vote in passing the watered down North Korea sanctions, the US warned that if China were to violate or fail to comply with the newly imposed sanctions against Kim's regime, it could cut off Beijing’s access to both the US financial system as well as the "international dollar system."

Speaking at CNBC's Delivering Alpha conference on Tuesday, Steven Mnuchin said that China had agreed to "historic" North Korean sanctions during Monday's United Nations vote. "We worked very closely with the U.N. I'm very pleased with the resolution that was just passed. This is some of the strongest items. We now have more tools in our toolbox, and we will continue to use them and put additional sanctions on North Korea until they stop this behavior."

In response, Andrew Ross Sorkin countered that "we haven't been able to move the needle on China, which seems to be the real mover on this, in terms of being able to apply the real pressure. What do you think the issue is? What is the problem?"

The stunner was revealed in Mnuchin's answer: "I think we have absolutely moved the needle on China. I think what they agreed to yesterday was historic. I'd also say I put sanctions on a major Chinese bank. That's the first time that's ever been done. And if China doesn't follow these sanctions, we will put additional sanctions on them and prevent them from accessing the U.S. and international dollar system. And that's quite meaningful."

And to underscore his point, the Treasury Secretary also said that "in North Korea, economic warfare works. I made it clear that the President was strongly considering and we sent a message that anybody that wanted to trade with North Korea, we would consider them not trading with us. We can put on economic sanctions to stop people trading."

In other words, to force compliance with the North Korean sanctions, Mnuchin threatened Beijing with not only trade war, but also a lock out from the dollar system, i.e. SWIFT, something the US did back in 2014 and 2015 when it blocked off several Russian banks as relations between the US and Russia imploded.

Of course, whether the US would be willing to go so far as to use the nuclear option, and pull the dollar plug on its biggest trade partner, in the process immediately unleashing an economic depression domestically and globally is a different matter. So far Washington has been reluctant to impose economic sanctions on China over concerns of possible retaliatory measures from Beijing and the potentially catastrophic consequences for the global economy. Washington runs a $350 billion annual trade deficit with Beijing, while the PBOC also holds over $1 trillion in US debt.

Ironically, the biggest hurdle to the implementation of the just passed sanctions may be the president himself. “We think it’s just another very small step, not a big deal,” Trump told reporters at the start of a meeting with Malaysian Prime Minister Najib Razak. "I don’t know if it has any impact, but certainly it was nice to get a 15-to-nothing vote, but those sanctions are nothing compared to what ultimately will have to happen,” said Trump who has vowed not to allow North Korea to develop a nuclear ballistic missile capable of hitting the United States.

Separately, at a hearing of the House Foreign Affairs Committee on Tuesday, Republican Chairman Ed Royce said the U.S. should target major Chinese banks, including Agricultural Bank of China Ltd. and China Merchants Bank Co., for aiding Kim’s regime. Russia also came in for criticism. Assistant Treasury Secretary Marshall Billingslea said in prepared remarks to the committee that North Korean bank representatives “operate in Russia in flagrant disregard of the very resolutions adopted by Russia at the UN.”

While China and Russia supported the latest UN sanctions, officials made clear they were troubled by Haley’s comments in the Security Council that the U.S. would act alone if Kim’s regime didn’t stop testing missiles and bombs. They emphasized the world body’s resolution also emphasized the importance of resolving the crisis through negotiations. “The Chinese side will never allow conflict or war on the peninsula,” Foreign Ministry spokesman Geng Shuang said in a statement on Tuesday.

In a soundbite late on Tuesday, Japan's Nikkei quoted prime minister Shinzo Abe who said that "in the end, [the North Korean] problems should be solved through diplomatic dialogue," adding that Japan will "work together with the international community to apply maximum pressure, so that North Korea commits to perfect, verifiable and irreversible denuclearization." For Japan to engage with the regime, he stressed it would have to be "on the condition that North Korea commits to" this complete denuclearization."

Which, of course, won't happen: “sanctions of any kind are useless and ineffective,” Russian President Vladimir Putin told reporters earlier this month at a summit in Xiamen, China. “They’ll eat grass, but they won’t abandon their [nuclear] program unless they feel secure.”

Predictably, North Korea's Foreign Ministry slammed the sanctions saying it “condemns in the strongest terms and categorically rejects” the United Nations adding more sanctions, North Korea’s state-run KCNA reported on Wednesday morning. Instead, North Korea warned it “will redouble efforts to increase its strength” as it seeks to establish “practical equilibrium” with U.S.

And so, not only is the entire geopolitical circle jerk back at square one, but the ball is again back in North Korea's court, while the decision on whether or not to launch another ICBM really depends on whether China will give it the quiet go ahead; a China which responds notoriously poorly to being threatened in the global financial arena, like for example when the US threatens to kick it out of the global dollar system...