South Korea's Defense Ministry responded. Pyongyang's government would "evaporate from the face of the earth" if it uses nuclear weapons.
Newly elected South Korean President Park Guen-hye said "We must deal strongly with a North Korean provocation."
White House National Security Advisor, Tom Donilon warned:
"There should be no doubt. We will draw upon the full range of our capabilities to protect against, and to respond to, the threat posed to us and to our allies by North Korea."
On March 30, North Korea announced a "state of war." It did so with the South. It's rhetoric belies continued policy. Conflict remains unlikely. Its official statement said in part:
"The moves of the US imperialists to violate the sovereignty of the DPRK and encroach upon its supreme interests have entered an extremely grave phase."
"The Supreme Command of the KPA in its previous statement solemnly declared at home and abroad the will of the army and people of the DPRK to take decisive military counteraction to defend the sovereignty of the country and the dignity of its supreme leadership as regards the war moves of the US and south Korean puppets that have reached the most extreme phase."
"It is the resolute answer of the DPRK and its steadfast stand to counter the nuclear blackmail of the US imperialists with merciless nuclear attack and their war of aggression with just all-out war."