The exercises are scheduled to last until nearly two weeks . Tensions on the South Korean peninsula are high after an attack on a Korean island . The live-fire drills are a routine monthly exercise aimed at securing the safety of ships in the area , the South 's Joint Chiefs of Staff told CNN last week . North Korea president says South Korea 's will pay `` a dear price '' for future provocations .
The exercises are scheduled to last until nearly two weeks . Tensions on the South Korean peninsula are high after an attack on a Korean island . North Korea president says South Korea 's will pay `` a dear price '' for future provocations .