• An American college student, Otto F. Warmbier, held prisoner in North Korea for more than a year, has been evacuated in a coma and is on his way back to the United States.

Mr. Warmbier, 23, was sentenced to 15 years of hard labor for attempting to steal a propaganda poster from a hotel. Three other American citizens are known to be detained in North Korea.

The release coincided with the abrupt arrival of Dennis Rodman, the ex-N.B.A. star, to Pyongyang. Mr. Rodman declined to say whether he had spoken about the trip with President Trump.