January 19, 2009	(11) North Korea announced entering comprehensive confrontation with Korea
May 27, 2009	(12) North Korea will take tough military measures against South's joining ‘Proliferation Security Initiative’
February 30, 2011	(13) North Korea announced the severance of contact with Lee Myung-bak’s government
April 5, 2013	(14) Peninsula tensions show signs of worsening