North Korea reported on the drill a day after its neighbors said they detected multiple ballistic missile launches and accused the North of carrying out provocations.

The test also appears to indicate Pyongyang’s objection to South Korean President Lee Jae Myung’s visit to Beijing.

North Korea's state media released photos Thursday of what it said was the hull of a nuclear submarine. Its leader denounced South Korea's plans to build its own subs as "an offensive act."

U.S. Combined Policy Forum, held this week, arrived at what participants described as a historical inflection point.

South Korean Defense Minister Ahn Gyu-back conducted his first inspection of the year on Thursday aboard an airborne early warning aircraft amid ongoing security concerns over North Korea, the defense ministry said. Ahn flew on the E-737 Peace Eye, accompanied by KF-21, FA-50, and TA-50 jets, News.Az reports, citing Yonhap.

A South Korean crypto exchange operator received four years in prison for espionage, working with a suspected North Korean hacker.

Lee’s visit is positive sign for China-South Korea relations. But both sides must heed the lessons from the THAAD dispute.