Participating U.S. forces included the Arleigh-Burke-class guided-missile destroyer USS William P. Lawrence and a maritime patrol aircraft, according to South Korean naval officials. South Korea contributed roughly 10 aircraft and 10 warships, including the destroyer ROKS Yulgok Yi I.

A reassessment by U.S. regarding North Korea's military capabilities marks a shift in understanding the country's defensive posture.

Plan to relocate 4,500 troops raises concerns about US commitment to Asia and threatens to undermine deterrence against China and North Korea.

The top military officers of South Korea and the US vowed to further strengthen the allies' trilateral security cooperation with Japan during their first video talks earlier this week, the

The latest United States ... North Korea's founding day in Pyongyang, North Korea, on September 9, 2018. Ng Han Guan/AP Photo U.S. forces have remained in South Korea with more than 28,500 ...

North Korean leader Kim Jong Un oversaw the country's air force drills and stressed the importance of a step-up in war preparation, according to state media.

North Korean leader Kim Jong Un called for ‘all units in the entire military’ to bring about ‘a breakthrough in war preparation’, state media said.

Pyongyang is dependent on the world's second-largest economy, but the "blood-cemented alliance" doesn't extend to security issues.