Why is it wrong that NK do Nuclear testing? I agree NK has some human rights issues, that should be addressed, but testing nuclear weapons is no different to Pakistan or India, and there are no sanctions against them.
Furthermore, as a member of the United Nations, North Korea has agreed to abide by binding decisions of the Security Council; UNSC resolution 1718 demands that North Korea not conduct any further nuclear test. This resolution was adopted under Chapter VII, meaning that the UNSC has identified North Korea's nuclear testing as a threat to the peace.
http://www.un.org/ga/search/view_doc.asp?symbol=S/RES/1718%2...