North Korea on Tuesday threatened military action if the South continued to violate its waters off the west coast, further stoking tension on the peninsula after the sinking of a South Korean warship. Read the full story

President Barack Obama has directed the U.S. military to coordinate with South Korea to “ensure readiness” and deter future aggression from North Korea, the White House said on Monday. Read the full story

An emotional President Lee Myung-bak vowed Monday that South Korea would respond “resolutely and unwaveringly” against those behind the deadly sinking of a naval ship near the tense maritime border with North Korea. Read the full story