North Korean leader Kim Jong Un oversaw hypersonic missile firing drills, state media reported Monday, citing a "grave geopolitical crisis" following U.S. military action in Venezuela.

South Korea's Joint Chiefs of Staff said in a statement it detected several ballistic missile launches from North Korea's capital region around 7:50 a.m. It stated that the missiles flew approximately 560 miles and that South Korean and U.S. authorities were analyzing the details of the launches.

Pyongyang will likely open room for a summit meeting with Washington while excluding dialogue opportunities with Seoul.

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."

Former People Power Party lawmaker Thae Yong-ho said Monday that N. Korea is likely to build a nuclear-powered submarine before S. Korea.

Venezuelan President Nicolas Maduro was in a New York detention ‌center on ​Sunday after President Donald Trump ordered an audacious U.S. raid to capture ‌the South American leader and take control of the country and its vast oil reserves.