When Donald Trump first announced that he planned to meet Kim Jong Un, many experts were sceptical that a summit between the US and North Korean leaders would ever actually take place. But the news that CIA director Mike Pompeo has recently visited North Korea makes it highly probable that the summit will indeed go ahead.
The possible shape of a US-North Korean deal is also beginning to emerge. President Trump has made it clear that he looks favourably on the idea of a peace treaty to bring a formal end to the Korean War of 1950-53. That conflict was ended by an armistice, rather than an actual peace settlement, and that remains the case today.