Thats according to North Korea (from Reuters)

North Korea denounced U.N. sanctions on Tuesday as a declaration of war, while across the border in Seoul an official said there were signs the reclusive Communist state may be preparing for a second nuclear test.

Defiant in the face of sanctions backed by even its closest ally, China, Pyongyang said it had withstood international pressure before and so was hardly likely to yield now that it had become “a nuclear weapons state”.