The trilateral Freedom Edge exercise comes after North Korea launched a nuclear-capable missile and sent troops to Russia.

Secretary of State Antony Blinken warns that North Korea is benefiting from aiding Russia in its war against Ukraine by potentially aiding Pyongyang's nuclear development, posing a threat for Europe and Asia.

SEOUL, South Korea -- North Korea ratified a major defense treaty with Russia stipulating mutual military aid, the North’s state media reported Tuesday, as the U.S., South Korea and Ukraine say North Korea has sent thousands of troops to Russia to support its war against Ukraine.