Asia Pacific Seoul: North Korea fires missiles into the sea as US-S. Korean military drills begin (+video)

Early Monday morning, two missiles launched from North Korea's west coast flew about 300 miles before landing in waters off the east coast.

Ahn Young-joon/AP

North Korea on Monday fired two short-range ballistic missiles into the sea and warned of "merciless strikes" against its enemies as allies Seoul and Washington launched annual military drills Pyongyang claims are preparation for a northward invasion.