SEOUL, South Korea (AP) — After a year of threats and diatribes, U.S. President Donald Trump and third-generation North Korean dictator Kim Jong Un have agreed to meet face-to-face for talks about the North's nuclear program.

It remains to be seen whether a summit, if it takes place, could lead to any meaningful breakthrough after an unusually provocative year. North Korea tested its most powerful nuclear weapon to date and test-launched three intercontinental ballistic missiles theoretically capable of striking the U.S. mainland.

Will there be a breakthrough? Failure? Or merely the start of a...