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China's foreign minister has arrived in North Korea's capital where he could meet with leader Kim Jong Un while trying to ensure a larger role for Beijing in the new round of nuclear diplomacy with Pyongyang that had been driven by Seoul and Washington.

Wang Yi's visit on Wednesday came days after Kim and South Korean President Moon Jae-in vowed to work toward the "complete denuclearization" of the Korean Peninsula, though they did not mention specific plans or timetables.

They also agreed to work toward formally ending the 1950-53 Korean War and push for three-way talks with Washington or four-way talks that also include Beijing to do so.

More substantial discussions on Pyongyang's nukes are expected between Kim and President Donald Trump, who could meet in May or June.