North Korea is known for its extensive military tunneling. Along with training thousands more troops, officials say the Pentagon is buying specialized gear such as night vision goggles.
It was the first such talks between the two countries in two years, with Seoul hoping for further dialogue that might lead to reunions between families divided by decades-old standoff.
President Trump enters his second year in office, fresh off his first legislative victory. Are there more to come? What about that Russia probe, hot spots overseas — and those midterm elections?
In the latest tweet to ratchet up tensions with Pyongyang, the president responded to the North Korean leader's New Year's address, in which he warned that his missiles could reach all of the U.S.
After trading bellicose barbs with North Korea throughout 2017, the U.S. heads into 2018 with an increasingly capable foe and no clear diplomatic exit ramps to temper the tensions.
One suspected transfer was seen in U.S. reconnaissance photos; South Korean media say ships have sold oil to North Korean vessels about 30 times since October.
The Department of the Treasury has identified two individuals, allegedly key figures in North Korea's ballistic missile development program, as targets for new sanctions.
It took decades, but John Coster-Mullen has pieced together specs for America's first nuclear bombs. Some believe his odyssey says something about North Korea's rapid nuclear progress.