US President Donald Trump has announced a second summit with North Korean leader Kim Jong-un, nine months after their first-ever meeting in Singapore.

The summit will take place in Vietnam’s capital Hanoi on February 27 and 28.

Mr Trump made the announcement via Twitter on Saturday (Friday local time) about the meeting in 26 days, saying he was looking forward to “seeing Chairman Kim & advancing the cause of peace!”

“My representatives have just left North Korea after a very productive meeting and an agreed upon time and date for the second Summit with Kim Jong Un.

“It will take place in Hanoi, Vietnam, on February 27 & 28. I look forward to seeing Chairman Kim & advancing the cause of peace!.

“North Korea, under the leadership of Kim Jong Un, will become a great Economic Powerhouse.

“He may surprise some but he won’t surprise me, because I have gotten to know him & fully understand how capable he is. North Korea will become a different kind of Rocket – an Economic one!,” he posted on Twitter.

North Korea, under the leadership of Kim Jong Un, will become a great Economic Powerhouse. He may surprise some but he won’t surprise me, because I have gotten to know him & fully understand how capable he is. North Korea will become a different kind of Rocket – an Economic one!

— Donald J. Trump (@realDonaldTrump) February 9, 2019

While in Asia, the US special representative for North Korea Stephen Biegun is thought to have discussed specific disarmament steps that Pyongyang could promise at the Vietnam summit and what corresponding measures the United States is willing to take.