He said there would need to be "complete" and "robust verification" of denuclearisation
The US will assist North Korea with its economy if Pyongyang gets rid of its nuclear weapons, its Secretary of State has said.
"If North Korea takes bold action to quickly denuclearise, the United States is prepared to work with North Korea to achieve prosperity on par with our South Korean friends," said Mike Pompeo.
Mr Pompeo said there would need to be "complete" and "robust verification" of denuclearisation, suggesting it would involve inspections to ensure the North's compliance.
"I think there is complete agreement about what the ultimate objectives are," Mr Pompeo said, though he declined to offer more detail.
He said his talks with Kim Jong Un had been "constructive", "warm" and "good".
"We talked about the fact that America has often in history had adversaries who we are now close partners with and our hope that we could achieve the same with respect to North Korea," he said.
He made the announcement at a joint news conference with South Korean foreign minister Kang Kyung-wha.
"We are very clear that sanctions remain in place until and unless we see visible, meaningful action taken by North Korea on the denuclearisation track," Ms Kang said.
She also said there must be "airtight" coordination between South Korea and the US ahead of Donald Trump and Kim Jong Un historic meeting on June 12th.
Amid concerns that North Korea will demand the US withdraw its troops from neighbouring South Korea, Ms Kang emphasised that the US military presence there must be "a matter for the US-ROK alliance first and foremost," using an acronym for South Korea's official name, the Republic of Korea.
She said the troop presence in the South for the past 65 years plays a "crucial role for deterrence", peace and stability on the Korean peninsula and argued it should not be on the table at the summit.
Mr Pompeo returned from Pyongyang on Thursday with three American detainees who had been released by North Korea.
The American said he had "good" and "substantive" conversations with Mr Kim during his visit.