White House spokesman Robert Gibbs said Wednesday that North Korea should live up to its promises and stop its provocations against the South.
Pyongyang says Seoul's decision to join an international nuclear anti-proliferation program is tantamount to a declaration of war. The North warned of military strikes and declared their 1953 armistice null and void.
Gibbs says North Korea has threatened to end the armistice many times in past decades but the peace has held.