The leaders of North and South Korea are to hold a summit meeting in Pyongyang later this month to discuss "practical measures" to denuclearise the Korean peninsula.

The summit, from 18-20 September, will be the third inter-Korean summit this year.

North Korean leader Kim Jong-un "reconfirmed his determination to completely denuclearise" the Korean peninsula when he met a high-level South Korean delegation yesterday.

After the meeting, South Korea's national security adviser, Chung Eui-yong, said the North Korean leader had also expressed his willingness to cooperate closely with South Korea and the United States to achieve that goal.

The summit could in turn provide renewed momentum to talks over denuclearlisation between North Korea and the United States, after US President Donald Trump cancelled a visit to the North by his secretary of state last month citing a lack of progress.

Mr Kim told South Korean officials his faith in Mr Trump was "unchanged" and he wanted denuclearisation and an end to hostile relations with the United States within Mr Trump's first term in office, ending in early 2021, Mr Chung said.

"He particularly emphasised that he has never said anything negative about President Trump," he said.

The remarks represent Mr Kim's first timeline for dismantling North Korea's nuclear weapons programme.

North Korea has said in previous, failed talks over the years that it could consider giving up its nuclear programme if the United States provided security guarantees by removing its troops from South Korea and withdrawing its so-called nuclear umbrella of deterrence from South Korea and Japan.

Donald Trump and Kim Jong Un met in Singapore last June

US officials involved in negotiations have said North Korea has refused to even start discussions about defining "denuclearisation" or other key terms such as "verifiable" and "irreversible", and have insisted the United States must first agree to take simultaneous steps to reduce economic pressure.

Mr Chung said Mr Kim had stressed the need for the United States to reciprocate North Korea's initial moves, which have included dismantling a nuclear test site and a missile engine facility.

The US Embassy in Seoul on has said it had no information to share on the matter.

North Korea's official KCNA news agency said Kim told Mr Chung and other envoys that it was his "fixed stand" to turn the Korean peninsula into "the cradle of peace without nuclear weapons and free from nuclear threat".

Mr Chung said Mr Kim showed "frustration over the doubt raised by some parts of the international community about his willingness to denuclearise, and asked us to convey his message to the United States".

"He said he would appreciate that such good faith is accepted with good faith," Mr Chung said. "He expressed his strong will to carry out more proactive measures toward denuclearisation if action is taken in response to the North's preemptive steps".

The two Koreas also plan to open an inter-Korean liaison office before the third summit in the North's border city of Kaesong, staffed by officials from both sides to facilitate consultation, Mr Chung said.

Mr Kim and Mr Trump held a landmark summit in Singapore in June, in which they agreed to work toward complete denuclearisation. But negotiations have made little headway, while signs North Korea has maintained work on its weapons have emerged.

In this year's talks, North Korea and the United States have been at odds over whether denuclearisation or declaring an end to the 1950-53 Korean War should come first.

The war ended with an armistice, not a peace treaty, meaning US-led UN forces, including South Korea, are technically still at war with the North.

North Korea has long sought a formal end to the war but US officials have said an end-of-war declaration could weaken the North's incentive for denuclearisation, and raise questions about the 28,500 US troops stationed in South Korea, a legacy of the three-year war.