Even as teams of advance staffers survey ornate hotel ballrooms in Singapore for the June 12 encounter, some of the President’s advisers privately say the chances of the talks occurring grew slimmer after North Korea adopted a harsher tone toward the US last week and raised questions about Kim’s commitment to, and definition of, denuclearization.

Trump himself remains committed to meeting Kim, and there has not been any indication he is preparing to call off the meeting himself, the officials said. But the new developments have led to a renewed impression that the audacious diplomatic meeting may not be as likely to occur as it once seemed…

“President Moon has to really deliver in terms of making President Trump feel like this summit isn’t going to go bust,” said Sue Mi Terry, a former CIA analyst and Korea expert. “No one wants to walk into a meeting that’s going to fail. I think tomorrow’s meeting is critical in terms of whether we’re really going to have Washington and Pyongyang meeting.”