"The position of the Democratic People's Republic of Korea as a nuclear weapons state which has been permanently specified in the supreme and basic law of the state has become irreversible," the DPRK permanent mission to the UN Office and international organizations in Vienna was quoted as saying, Reuters reported.
DPRK is short for the North's official name, the Democratic People's Republic of Korea.
While criticizing the US push for denuclearization as a "provocative act" of interfering in its internal affairs, Pyongyang defended its nuclear weapons as an "inevitable option" of defending the country from US nuclear threats.