Trump, Kim to pledge to continue talks

In a twist worthy of reality television, US President Donald Trump and North Korean leader Kim Jong-un have conclude an historic personal meeting in Singapore with an unscheduled signing.

Trump, in a post lunch walk with Kim around the grounds of the Capella Hotel, told reporters they were "heading for a signing." He also added that talks had gone "better than anybody could have expected".

Trump said the North Korean denuclearisation process would be starting "very quickly", as he and Kim signed an unspecified document.

Kim declared the "world will see a major change" and he and Trump "decided to leave the past behind" as they signed the document.

Trump also said he "absolutely" would invite Kim to the White House.

Citing unnamed US officials, CNN reported that the two leaders were signing an agreement acknowledging the progress of the summit and pledge to keep momentum going.

President Trump and the North Korean leader looked relaxed after the working lunch, with the US President showing his armoured limousine, "The Beast," to Kim at the end of their post lunch walk.

Prior to the Singapore summit, President Trump had stressed the importance of first impressions at the meeting.

"I think I'll know very quickly whether or not something good is going to happen. I also think I'll know whether it will happen fast," he said at the G7 summit.

Kim is scheduled to leave Singapore on Thursday afternoon, with President Trump leaving in the evening, after a planned media conference.