South Korea's president has said that North Korea will face consequences for future aggression.
Lee Myung-Bak said he feels "deep responsibility" for failing to protect South Koreans from a deadly North Korean artillery attack last week.
As Lee spoke, a nuclear-powered U.S. super carrier and a South Korean destroyer participated in joint military exercises.
The united show of force came almost a week after the attack on Yeonpyeong Island killed four, including two civilians, and sent tensions soaring in the region.
In China, Beijing's top nuclear envoy Wu Dawei called for a meeting in early December of the six powers involved in nuclear disarmament talks, including North Korea.
Meanwhile, North Korean state media has called a joint U.S.-South Korean naval drill a "grave provocation" and a "crime" which had brought the region to "the brink of war."
compiled from agency reports