The latest missile firing comes amid heightened tensions on the peninsula, following wide international condemnation for the North's January nuclear test.
Otto Warmbier, a 21-year-old University of Virginia student, had attempted to steal a propaganda sign from his Pyongyang hotel. He was convicted of subversion. The White House called for his release.
This year's war games between the U.S. and South Korea are the largest ever. In response, North Korea's Kim Jong Un threatened to unleash a "preemptive nuclear strike of justice."
After the isolated nation conducted a January nuclear test and February rocket launch, the Security Council has unanimously voted for new sanctions targeting Pyongyang's weapons program.
Appearing to weep at one point in the video, Otto Frederick Warmbier says, "Please, I've made the worst mistake of my life, but, please, act to save me."
Samantha Power, the U.S. ambassador to the United Nations, says the proposed U.N. Security Council resolution "is nearly unprecedented in many respects and the toughest ... in more than two decades."
North Koreans know little about the outside world. Activists are smuggling in flash drives — loaded with documentaries, TV shows and Wikipedia — to help change that.
The Kaesong Industrial Complex is the last remaining show of North-South cooperation, but it's closing indefinitely following the North's recent rocket launch and nuclear test.