Defense Secretary Hagel's comments about the North's chemical arsenal come amid new concerns over the sophistication of North Korea's nuclear weapons program.
When North Korea shut down the industrial park it jointly maintained with South Korea in April, it ratcheted tensions to a new high.
Russians, Chinese, Brazilians, and others are traveling abroad as never before as the world's growing middle classes get itchy feet.
On the 63rd anniversary of the Korean War that divided the peninsula, hackers hit systems in both North and South Korea.
North Korea's refusal to take South Korea's phone calls has dashed hopes for proposed peace talks.
Relations between the North and the South have been more strained than usual lately, but an agreement to discuss reopening a joint factory venture could shift the mood in the region.
Only one prisoner born in North Korea's gulag is known to have escaped to tell his story. A Q&A with Blaine Harden, the journalist who wrote about Shin Dong-hyuk.
Many Korea watchers speculated that once joint military drills ended, so would increased tensions with North Korea. But at least one analyst says this might be the moment the North lashes out again.
The last tangible thread of cooperation between Pyongyang and Seoul was cut today, with South Korea announcing it would pull the remaining workers from a sprawling factory complex in the North.