1. The White House is busy planning for President Trump’s potential meeting with Kim Jong-un of North Korea. The idea is so risky — and seemingly far-fetched — that some of Mr. Trump’s aides believe it will never happen. Above, a news broadcast in Seoul.

Here’s what we know about Mr. Kim, the enigmatic 34-year-old dictator. And we have the back story of how two South Korean envoys brought Mr. Kim’s invitation to Washington. They were shocked when Mr. Trump accepted.