Armistice nullified

On April 6, 2013, the United Nations Security Council unanimously voted strict economic sanctions against North Korea in response to its third nuclear test.  With China in agreement, which is rare, with the rest of the Security Council (especially the United States), the UN made it harder for the People's Republic of North Korea to buy international goods and to launder money.  China has not cracked down in a long time, so it is upset with the North Koreans for blowing up a bomb on its doorstep.
      In retaliation, Kim Jung Un has nullified the 60 year old armistice ending the Korean War and has threatened a pre-emptive strike upon South Korea and the United States.  So, far no one has taken this seriously.  But, never before has North Korea threatened anyone with nuclear attack.  Earlier, a South Korean general threatened to strike back at the North Korean leaders if there was an actual attack.  Meanwhile, the U.S. has said it will not reward these threats.  Kim Jung Un has been creative with threats: "A sea of flames, with lighter and smaller nukes."