TEHRAN, Young Journalists Club (YJC) - John Bolton, who remains a top US security advisor, said the world only had "one play left" in dealing with North Korea.
This follows remarks from US Secretary of State Rex Tillerson and the South Korean Government that diplomatic efforts have not been exhausted yet.
However, Bolton claimed that sanctions had no impact on Kim Jong-un's regime and one way or another the leadership will have to be toppled.
Speaking to Fox News, Bolton said that US President Donald Trump should now focus on persuading China that wiping out the North Korean regime was in their national interest.
He told the US broadcaster: "These threats will only grow worse next year, especially with both China and Russia trying to two-time us this week.
"I don’t think North Korea will ever voluntary give up their nuclear program. Enormous pressure through sanctions has not slowed down the regime at all.
"This is a prison-camp of an economy, its people live desperate lives - but there's been no impact on the nuclear tests.
"There is one diplomatic play left here. You cannot coerce China into this, but you can persuade them that their national interest requires getting rid of this regime.
"Reunification of the peninsula is the way to go but there may be other options.