The overriding question is whether Trump, who has professed to have exchanged 'love notes' with Mr. Kim, will angle for a fourth summit.

First Trump administration saw angry threats and diplomatic meetings between president and North Korean leader

North Korean leader Kim Jong Un said past talks with the US merely confirmed Washington’s “unchangeable” hostility toward Pyongyang, in comments delivered at an arms exhibition showing off the country’s latest missiles designed to hit the US mainland.