Here are four scenarios.
Singapore's foreign minister says it's "all systems go" for a summit between U.S.
Throughout he has controlled the spectacle.
Trump's remarks came two days after he said he didn't need to do a lot of preparation ahead of the historic summit because the interpersonal relationship between the two leaders would be the more important factor. It's news that we follow every day because it's a life-changing event. And by exploiting that serendipity, he has brought the United States to the table. PSCORE is a nonprofit that promotes reunification, raises awareness about human rights issues in North Korea, and helps defectors adjust to life in South Korea.
Some analysts suggest that, rather than lead to a US-North Korea confrontation, a failed summit will result in renewed diplomatic efforts by South Korea - and possibly others - to restore stability and maintain North Korean restraint, so as to avoid the prospect of renewed escalation of military conflict. So that could yet swing back again.
"We could absolutely sign an agreement and we're looking at it", said Trump. He says it is his "maximum pressure" approach that enabled a breakthrough that his successors could not. "Trump, who prides himself on his deal-making prowess, said he thinks he will know 'within the first minute" of meeting Kim whether the North Korean leader is serious about the nuclear negotiations.
And then he did. "So we've got to make sure that it's complete".
North Korea has a reputation for pocketing rather than reciprocating unilateral concessions.
"South Korea, China and Russian Federation may decide to lift their own sanctions but the regime would still be left in a tough situation, thanks to United Nations sanctions and independent sanctions by the USA and Japan", Kotani said.
Poll numbers that showed most Americans - on both sides of the aisle - approve of his handling of North Korea.
Trump on Saturday doubled down on his promise that the U.S. And so a determined Mr Moon has adopted the role of mediator.
While Seoul technically plays no part in the bilateral meeting between Washington and Pyongyang, it will be affected by the outcome of the talks. On Saturday, he told reporters that while he was optimistic, Kim would only get one chance.
The one thing it is impossible for North Koreans to understand, however, is how big the difference in prosperity is between their country and developed nations like the US and South Korea.
The Chinese leader's role is the most opaque.
Subsequently, North Korea announced a series of domestic special economic zones, while also ramping up missile testing to over twenty tests per year in 2016 and 2017.
When Mr Kim first emerged from worldwide isolation this year it was for a secret meeting with Xi Jinping. We did not vote [on the issue], but it has been discussed.
One week after the leaders smiled over tea in Dalian, Pyongyang returned to old form, lobbing blistering attacks at the US.
Exactly what hand Mr Xi is playing isn't clear.
Japan had hoped to convince the USA to shield it from fresh tariffs on steel and aluminum imports, and did not hide its bitter disappointment when those talks failed. (Jennifer Barr/CBC) North Korea has remained publicly silent, leaving the White House to set the stage and manage expectations about the summit.