The US President says he has had "substantive talks" with Pyongyang, insisting "very good things" are now on the way.
Donald Trump has confirmed a date and location has been set for his historic meeting with North Korean leader Kim Jong Un.
He said the details of the summit would be announced soon, with the White House saying it could take place this month as long as North Korea makes specific concessions.
Speaking to reporters, Mr Trump said "a lot of things have happened" with regards to US citizens reportedly being held in North Korea.
"We're having very substantive talks with North Korea and a lot of things have already happened with respect to the (US) hostages," he said. "I think you're going to see very good things."
The American President also said the prospect of withdrawing troops from South Korea was "not on the table".
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It comes as the UN Aviation Agency said North Korea had requested new air routes to South Korea and that the regime's request was "under consideration".