The war of words continues to escalate on the Korean Peninsula while the US beefs up its presence there by sending in additional warships.
North Korea has moved a missile with "considerable range" to its east coast. But South Korea says there are no signs the North is preparing for a full-scale conflict.
Still, the Pentagon is surrounding the Korean Peninsula with layers of missile defense sending two guided missile destroyers and land-based interceptors to Guam.
A team of US chemical weapons experts returned to South Korea today for the fist time in eight years. North Korea has the world's second largest stockpile of chemical weapons.
"It only takes being wrong once and I don't want to be the Secretary of Defense that was wrong once," Chuck Hagel said.
North Korea warns that it has been authorized to attack the U.S. using "smaller, lighter and diversified" nuclear weapons. Nuclear weapons expert Andrea Berger thinks they're bluffing. "At the present time we don't feel that North Korea has the ability to miniaturize a nuclear warhead and put it atop a ballistic missile to send to Washington, Guam or Hawaii."
Military analyst Daniel Pinkston of the International Crisis Group says the North Koreans know they cannot win in a conflict with the United States. "North Korea is obsessed with the military balance, they are very aware of military power and when it's not in their favor, they can be deterred because they wish to survive. so attacking the U.S. would be committing suicide."
But the U.S., with 28-thousand troops on the Korean peninsula, must take the threats from Pyongyang seriously. Commander of United Nations Forces in Korea, General James Thurman, said, " I think we should always be concerned when somebody is threatening our
homeland and threatening our allies, and it's causing instability in the region."
Meanwhile, hackers have apparently broken into at least two of North Korea's government-run online sites. North Korea's Flicker site showed Kim Jong Un's face with a pig-like snout. A caption accuses Kim of threatening world peace "while his people starve to death."