North Korea's Vice-Chairman of the Central Committee of the WorkersImage copyright

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Kim Yong-chol, who visited the White House on Friday, is close to the North Korean leader

US President Donald Trump is to meet North Korean leader Kim Jong-un for a second summit by the end of February, the White House says.

The announcement came after Mr Trump met top North Korean negotiator Kim Yong-chol at the White House.

He had been expected to deliver a letter from Kim Jong-un to Mr Trump.

Little progress has been made on denuclearisation since their historic summit in Singapore last June. No venue has been announced for the new summit.

Speculation is mounting that it could be held in Vietnam.

Kim Yong-chol’s visit to Washington is the first sign of movement in nuclear diplomacy with North Korea for months, BBC state department correspondent Barbara Plett Usher reports.

It is not clear what the reported letter from Kim Jong-un contained. But it was expected to lay the groundwork for another summit, our correspondent adds.

President Trump said he was looking forward to the talks.

What has happened since the last summit?

Not very much was agreed on in the Singapore summit, so there is little to measure success by.

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The Singapore summit was the first such meeting for a sitting US president

Nuclear negotiations between Washington and Pyongyang have stalled, no detailed account of North Korea’s nuclear facilities has been provided and sanctions are still firmly in place.

Mr Kim however, has been busy boosting his global image. He’s improved relations with neighbouring South Korea, and both countries have destroyed guard posts along the heavily guarded demilitarised zone – and paid trips to each other’s countries.

Ties between North Korea and China also appear to have improved, with Mr Kim making multiple trips to Beijing to meet President Xi.

What was achieved at the Singapore summit?

The summit was historic for the fact that it happened at all – but on paper, all it really achieved was a vaguely-phrased agreement in which both countries agreed to work towards denuclearisation.

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Media captionTrump Kim summit: Win-win, or a Kim win?

It was never really made clear what denuclearisation would entail – the agreement did not include any timeline, details or mechanisms to verify this process.

If there is a second summit, many will be expecting something more concrete to come out of it. Both North Korea and the US are unlikely to get away with calling another vague agreement a success.

Where is North Korea’s nuclear programme currently at?

North Korea hasn’t conducted a missile test since the summit. It’s also dismantled a nuclear testing site and a key missile engine facility.

It did however test out a new “high-tech” tactical weapon last November – its first official report of a weapons test in a year. This however, was not taken to represent a huge threat.

But it’s still not clear how many nuclear facilities still exist in North Korea.

A report earlier last year based on satellite imagery had identified the extent of North Korea’s network of missile bases.

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Media captionHow is North Korea evading sanctions?

However, this is not a breach of the Singapore agreement – as North Korea has not made any commitment to halt any weapons development or shut down its missile bases.