N.Korea fires missile after threat: Seoul

Broadcaster YTN reported that an air raid warning was issued on the South Korean island of Ulleung around the time of the missile launch.

A spokesman for South Korea's military said they were checking to see whether the air raid warning was related to the missile launch.

The United States and South Korea began one of their largest combined military air drills on Monday, with hundreds of warplanes from both sides staging mock attacks 24 hours a day.

North Korea has test-fired a record number of missiles this year, and has said that a recent flurry of launches were in response to the allied drills.