North Korea's Kim knows denuclearisation must be 'quick': Pompeo

Kim Jong Un understands that denuclearisation must happen "quickly", US Secretary of State Mike Pompeo said today, warning there will be no sanctions relief for Pyongyang until the process is complete.

Washington remained committed to the "complete, verifiable and irreversible" denuclearisation of North Korea, Pompeo added, after the historic US-North Korea summit in Singapore drew criticism for its vague wording on plans for Pyongyang to give up its nuclear weapons.

"We believe that Kim Jong Un understands the urgency... that we must do this quickly," he said of the effort to have North Korea abandon its nuclear weapons.

Washington's top diplomat was in Seoul to brief his South Korean and Japanese counterparts after President Donald Trump's post-summit comments sparked confusion and concern in Tokyo and Seoul.

But Pompeo insisted at a joint press conference with the two countries' foreign ministers that there was no daylight among the allies on how to achieve the denuclearisation of North Korea.

Contrasting the Trump policy with previous US administrations, Pompeo said: "In the past, they were providing economic and financial relief before... complete denuclearisation had taken place."