In spite of making retaliatory threats last week, North Korea did not act after South Korea held a military drill. The North had originally threatened action if the South went forward with planned exercises near a naval border between the two nations.

The South Korean military conducted navy exercises in waters near the disputed border with North Korea today.

South Korea made the move following a suspected North Korean torpedo attack that killed 46 people.

The report relies on South Korean forensic evidence that the torpedo which sank the Cheonan was North Korean.

President Barack Obama has unveiled a new nuclear weapons policy today that would limit the circumstances under which the U.S. would use nuclear weapons.