North Korean leader Kim Jong-un has invited Donald Trump to meet him, an invitation the US leader has said he will accept.
The shock announcement was made by senior South Korean officials in Washington, who passed on a letter from the North Korean leader.
They said Mr Kim had also agreed to halt nuclear and missile tests and was “committed to denuclearisation”.
It appears to be a major breakthrough after months of threats and violence.
The South Korean delegation had held unprecedented talks with Mr Kim in Pyongyang earlier this week, part of a diplomatic thaw following the Winter Olympics in South Korea, then travelled to the US to pass on their message.
Mr Trump, who has previously said there is no point in talking to North Korea, said the development was “great progress”.
But he said sanctions will remain in place until a firm agreement is reached.
The problem with North Korea is that they are liar liars who lie. The emphasis must be on “verify.”