DONALD TRUMP and Kim Jong Un have concluded an extraordinary nuclear summit with the US president pledging unspecified “security guarantees” to the North and Mr Kim recommitting to the “complete denuclearisation of the Korean peninsula”.

Meeting with staged ceremony on a Singapore island, the pair came together for a summit that seemed unthinkable months ago, clasping hands in front of a row of alternating US and North Korean flags, holding a one-on-one meeting, additional talks with advisers and a working lunch.

Both leaders expressed optimism throughout roughly five hours of talks and, speaking at a news conference after the meeting, Mr Trump thanked Mr Kim for “taking the first bold step toward a bright new future for his people”.

The president said “real change is indeed possible” and he is prepared “to start a new history” and “write a new chapter” between the two nations, adding: “The past does not have to define the future.”

Mr Trump added during a free-flowing news conference that Mr Kim has “an opportunity like no other” to bring his country back into the community of nations if he agrees to give up his nuclear programme.

The president announced he will freeze US military “war games” with ally South Korea while negotiations between the two countries continue. He cast the decision as a cost-saving measure, but Pyongyang has long objected to the drills as a security threat.

Mr Trump acknowledged that the timetable for denuclearisation is long, but said: “Once you start the process it means it’s pretty much over.”

The president acknowledged that US intelligence on the North Korean nuclear stockpile is limited, “probably less there than any other country”, but added: “We have enough intelligence to know that what they have is very substantial.”

Mr Trump said Mr Kim accepted his invitation to visit the White House at the “appropriate” time.

Light on specifics, the document signed by the leaders largely amounted to an agreement to continue discussions. It did not include an agreement to end the technical state of war between the US and North Korea.