South Korean and US troops placed on high alert - Times Online

The announcement that the North would no longer observe the Armistice after South Korea joined the Proliferation Security Initiative, a multilateral effort to limit the spread of weapons of mass destruction by intercepting shipping and aviation. The North has threatened to abandon the Armistice five times in the past 15 years.

But after the underground nuclear test, then drills involving the firing of short-range missiles, and finally the renunciation of the Armistice, the question is what the North might do next. South Korean media speculated that Pyongyang might test launch another long-range missile, or engineer a skirmish on land or sea.