South Korea -- Artillery drills set to be conducted by South Korea this week have prompted a fresh salvo of hostile rhetoric from North Korea.
It says U.S.-South Korea cooperation could bring a nuclear war to the Korean Peninsula.
The warning comes amid lingering tension nearly three weeks after the North's deadly shelling of a South Korean island. Two South Korean marines and two civilians were killed. The attack came during a military drill. But the South says it fired shells southward, not toward the North, as part of routine exercises.
A military official downplayed this week's drills, saying they were regularly scheduled.