US Vice President Mike Pence has said President Donald Trump plans to meet North Korean leader Kim Jong-un in 2019.
Mr Pence said past mistakes of allowing promises to be broken on pledges to end arms programmes would not be repeated.
The United States and North Korea have been discussing a second meeting between their leaders to follow up on the Singapore summit in June, and lay the groundwork for ending a nuclear stand-off between the old foes.
“The plans are ongoing. We believe that the summit will likely occur after the 1st of the year but the when and where of that is still being worked out,” Mr Pence told reporters after meeting South Korean President Moon Jae-in.
“We don’t want to repeat the mistakes that prior administrations, frankly in both political parties, have made over the last several decades where promises are made, sanctions are lifted, economic support comes and then promises are broken.”