US Director of National Intelligence Dan Coats says it is technically possible for North Korea to eliminate its nuclear weapons program within a year, but it is not likely to happen.
Asked at the Aspen Security Forum in Colorado about White House national security adviser John Bolton's statement that North Korea could denuclearise in a year, Coats said: "It's technically possible but probably not going to happen."
"It's a much more complicated process than most people think," Coats told the forum.
He added that US Secretary of State Mike Pompeo had "clearly said this is hard, this is going to take some time" and projected a "longer time frame."
There has been no sign of concrete action toward denuclearisation by Pyongyang since US President Donald Trump and North Korean leader Kim Jong-un held a summit in Singapore on June 12.
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Pompeo visited Pyongyang in early July and the two sides struggled to make headway on the denuclearisation issue.
Trump on Tuesday told reporters there was "no rush" and "no time limit" on denuclearisation negotiations with North Korea.
Coats said that Kim had made a commitment to denuclearise and that he and other senior officials had continued to reassert that commitment.
"I don't think we should go forward with the assumption that all this is going to work," Coats said.
"But having the opportunity to try to succeed here instead potentially going to war with a potentially nuclear-armed nation and what we have evaluated as a somewhat unstable leader, why not give it a shot?"
Coats said it was not a matter of trusting the North Koreans but of ensuring proper verification mechanisms were in place.
"We know, and we have the capability to know, what they're doing, and we're going to make sure we do it right," he said.
The US intelligence chief said sanctions against North Korea were still broadly holding, supported by China, Russia and other nations, dramatically driving down Pyongyang's exports and forcing Kim to consider "a potential collapse of his economy if he can't do something moving forward with this."
