Chinese President Xi Jinping offered North Korean leader Kim Jong Un firm backing in deadlocked nuclear talks with the US, insisting the two sides should meet "halfway", state media said on Thursday.

Kim visited Beijing by train this week for two days of discussions that reasserted China's role in the process, and were seen as a strategy session ahead of a second summit between the North Korean leader and US President Donald Trump.

At their first meeting in Singapore in June, Kim and Trump signed a vaguely worded document with Kim pledging to work toward the "denuclearisation of the Korean peninsula".

But progress has since stalled with Pyongyang and Washington - which stations 28 500 troops in South Korea - disagreeing over what that means.

North Korea wants relief from the multiple sets of sanctions imposed on it over its nuclear weapons and ballistic missile programmes, while the US wants the measures to remain in place until Pyongyang gives up its arms - something it has made no public promise to do.

Sanctions

China also wants the sanctions relaxed and Xi said he "hopes that the DPRK and the United States will meet each other halfway" according to China's state news agency Xinhua, using the initials of the North's official name.

Xi "spoke highly of the positive measures taken by the DPRK side", it added.

North Korea has carried out six nuclear blasts and launched missiles capable of reaching the whole of the US, but has performed no such tests for more than a year, and blew up the entrances to a nuclear testing ground it said it no longer needed.

Pyongyang has rejected demands for what it calls its "unilateral" disarmament as "gangster-like".

China is the North's sole major ally and key trade partner but relations had deteriorated over Pyongyang's nuclear activities, before warming up last year, with Kim meeting Xi three times.

Kim noted the "difficulties and concern" in talks with the US, according to Pyongyang's official KCNA news agency, which said the Chinese leader had issued a ringing endorsement of the North's position.

Xi said that "the principled issues suggested by the DPRK side are deserved requirements and its reasonable points of concern should be resolved properly", it said.

Each of the previous Kim-Xi meetings have come shortly before or after the North Korean summits with either Trump or South Korean President Moon Jae-in.

Trump said on Sunday the US and North Korea were negotiating the location of their next summit, a meeting Moon said Thursday was "imminent".

Pyongyang needed to take "bold, practical measures for denuclearisation" to ensure sanctions are lifted, he told reporters, but added that "corresponding measures" were also needed from the US, such as agreeing a "peace regime" and formally declaring an end to the 1950-53 Korean War.

KEEP UPDATED on the latest news by subscribing to our FREE newsletter.

- FOLLOW News24 on Twitter