Former US national security adviser John Bolton sharply slammed President Donald Trump’s North Korea policy, warning that Pyongyang poses an imminent threat, CNN reported.

Bolton told Axios he does not think the White House "really means it" when President Donald Trump pledges to halt the hermit nation from nuclear weapon development or "it would be pursuing a different course."

"We're now nearly three years into the administration with no visible progress toward getting North Korea to make the strategic decision to stop pursuing deliverable nuclear weapons," he told the news outlet.

Bolton also criticized Trump for saying that North Korean short-range missile tests did not bother him.