They involved other restrictions. North Korea said "the US is set to light a fuse for nuclear war." Its military "exercise(s) the right to a (defensive) preemptive nuclear attack."
Its state-run Rodong Sinmun said "the armistice agreement has been nullified. (N)o one can expect what will happen next."
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."
"Time has come to stage a do-or-die final battle."
"From this moment, the north-south relations will be put at the state of war and all the issues arousing between the north and the south will be dealt with according to the wartime regulations."
"The state of neither peace nor war has ended on the Korean Peninsula."
"".(T)he Korean people will give vent to the pent-up grudge and realize their cherished desire and thus bring a bright day of national reunification and build the best power on this land without fail."
White House National Security Council spokeswoman, Caitlin Hayden said:
"We've seen reports of a new and unconstructive statement from North Korea. We take these threats seriously and remain in close contact with our South Korean allies."