WASHINGTON (AP) - The White House says North Korea's threats against South Korea will not give it the attention Pyongyang wants and will only add to its isolation. 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.