If the nuclear talks between President Donald Trump and North Korean leader Kim Jong Un are actually taking place, this will mark the culmination of a long and unusual journey.
The planning continues. According to the White House, teams work in the demilitarized zone between North and South Korea and in Singapore. On Wednesday, a senior North Korean official, Kim Yong Chol, arrived in New York ahead of scheduled talks with Secretary of State Mike Pompeo.
"I think that anyone who has negotiated with North Korea in the past knows that these changes, threats, are not emerging – that's not really new to North Korean behavior," said Lisa Collins, a member of the Korea Chair on Center for Strategic and International Studies. "What's different here is the personalities involved, namely Kim Jong Un and Donald Trump."
Here's a timeline of how things have developed in United States-North Korea relations since Trump's inauguration.