Donald Trump and Kim Jong-un will meet in Hanoi for a second high-level summit on February 27-28, where the two will try to find a way forward on the intractable issue of North Korea’s nuclear program. A lot will be riding on the meeting: personal reputations and political fortunes, future trends in nuclear nonproliferation, regional power dynamics, and most of all the distant yet all-too-possible prospect of renewed military, even nuclear conflict.

Here’s what US success (and failure) would look like at the upcoming summit: