North Korea has fired a short-range missile into its own eastern waters, its fifth missile test in just three days.
The South Korean Defense Ministry said the North's missile was fired early on May 20, although it was unclear what type of missile was used.
Pyongyang said the tests are part of legitimate drills to bolster deterrence against what it describes as U.S. and South Korean threats to attack the North.
North Korea has criticized joint U.S. and South Korean military exercises last month as a rehearsal for an attack on its territory.
Tensions with North Korea have escalated since the United Nations adopted sanctions over Pyongyang's third nuclear test conducted in February.
Based on reporting by Reuters, AP, and AFP