On 9 October 2006 , North Korea announced that it has performed its first-ever nuclear weapon test . On 18 December 2006 , the six-party talks finally resumed . On 13 February 2007 , the parties announced " Initial Actions " to implement the 2005 joint statement including shutdown and disablement of North Korean nuclear facilities in exchange for energy assistance . Reacting to UN sanctions imposed after missile tests in April 2009 , North Korea withdrew from the six-party talks , restarted its nuclear facilities and conducted a second nuclear test on 25 May 2009
nuclear weapon test
2006 North Korean nuclear test
Nuclear proliferation