On April 13, the U.N. Security Council condemned North Korea's rocket launch earlier in the month.

Within nine hours, North Korea denounced and rejected the Security Council statement; expelled international inspectors and the U.S. technical team from its Yongbyon nuclear facilities; walked away from the Six-Party Talks and all previous agreements; threatened to strengthen its "self-defensive nuclear deterrent"; and said that it would restore its nuclear plant to normal operation and reprocess spent fuel rods.

Two weeks later, the North Korean Ministry of Foreign Affairs threatened to take measures that "will include nuclear tests and test-firings of intercontinental ballistic missiles" and "will make a decision to build a light water reactor power plant and start the technological development for ensuring self-production of nuclear fuel as its first process without delay" unless the Security Council promptly apologizes for its infringement on North Korea's sovereignty.

http://www.thebulletin.org/web-edition/features/the-risks-of-north-koreas-nuclear-restart