Vipin Narang, a nuclear nonproliferation specialist at MIT, agreed. "It's a fantasy that they're going to willingly give up their nuclear programmes so long as Kim is in power. He saw the fate of Saddam and Gaddafi — why would he give up his nuclear weapons?" asked Narang. Trump's willingness to pull out of the international nuclear deal with Iran would only heighten North Korea's mistrust of a negotiated denuclearisation agreement with the US.
Kim has pursued nukes as a way to fend off outside threats and bolster his legitimacy inside North Korea. "The only way you can convince them to denuclearise is to make nuclear armament costly enough to destabilise the regime," said Chun Yung Woo, a former South Korean nuclear negotiator with the North. "To do that would require a total economic blockade to suffocate the regime."
In Washington, there is a growing sense that time is not on the United States' side. CIA Director Mike Pompeo said in October that North Korea was only a matter of months away from perfecting its nuclear weapons programme.
Trump and McMaster have repeatedly said that military options are on the table, a message that North Korea takes especially seriously when US fighter jets are practicing precision strikes on the Korean Peninsula. This is coupled with frequent assertions that Kim is an irrational madman who can't be deterred in the way that the US military deterred his father and grandfather.
"There are a lot of people who argue that there's still a window to stop North Korea from getting an ICBM with a nuclear warhead to use against the United States," said Narang. "They're telling themselves that if they strike now, worst-case scenario: Only Japan and South Korea will eat a nuclear weapon."