North Korea launched multiple ballistic missiles into the sea following the start of joint South Korea-US military exercises. Pyongyang views these drills as preparation for an invasion, while the US insists they are defensive.

North Korea on Monday condemned joint U.S.-South Korean military drills as a "provocative act," warning of the danger of sparking war with "an accidental single shot," days after Seoul's air force mistakenly bombed a village on its own territory.

The U.S. aircraft carrier USS Carl Vinson arrived at the southern port city of Busan in South Korea on Sunday as a show of force against North Korea, South Korea's navy said.