Source:
apSEOUL, South Korea – North Korea declared waters along its disputed sea border with South Korea a "firing zone" Monday and warned ships from the South to stay away from the area, which was the scene of a deadly clash last month.
The naval command in Pyongyang accused the South of "reckless military provocations" in the area in an attempt to hold on to what it called an illegal border. It accused its neighbor of violating its waters and staging military drills in the area and vowed to protect its border by force.
North Korea does not recognize the sea border, drawn unilaterally by the United Nations at the end of the 1950-53 Korean War, and has long claimed that it should be redrawn farther south. The dispute led to deadly skirmishes in 1999, 2002 and last month.
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Relations between the two Koreas soured badly after South Korea's conservative President Lee Myung-bak took office last year with a pledge to get tough on the North's nuclear ambitions, and he halted unconditional aid to the impoverished neighbor. An angry Pyongyang suspended reconciliation talks and joint projects.
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http://news.yahoo.com/s/ap/20091221/ap_on_re_as/as_koreas_tension
no good.