It is North Korean leader Kim Jong-un's "fixed will" that a summit with US President Donald Trump in Singapore should go ahead, state media say.

This followed a surprise meeting on Saturday between Mr Kim and the South's Moon Jae-in, who said the North was "committed to denuclearisation".

Mr Trump had cancelled the 12 June summit, citing the North's "hostility".

But on Saturday he said that the date "hasn't changed" and that things were "moving along very nicely".

The summit would be the culmination of diplomatic efforts that began this year to try to defuse what had threatened to become a military confrontation between the nuclear-armed communist North and the South and its US ally.

What came out of Saturday's surprise talks?
The North's KCNA agency released a detailed statement on the meeting and the South Korean president also delivered remarks. It was the leaders' second meeting in as many months.

Mr Moon said he and Mr Kim had "agreed that the 12 June summit should be held successfully" and that the North Korean leader had "again made clear his commitment to a complete denuclearisation of the Korean peninsula".

But Mr Moon suggested Mr Kim was not certain whether Washington could guarantee the stability of his regime.

"What Kim is unclear about is that he has concerns about whether his country can surely trust the United States over its promise to end hostile relations," Mr Moon said.

The KCNA statement said the two leaders had had a "candid dialogue" and that Mr Kim had "expressed his fixed will on the historic... summit talks". He had called for co-operation to "establish a mechanism for permanent and durable peace" and the opening of a "new era of reconciliation and unity".

It added that "top leaders" from the two nations would hold more talks on Friday.