The permanent mission of North Korea to the United Nations said the country's position as a nuclear weapons state was irreversible, denouncing US "anachronistic" claims for denuclearisation, state media KCNA reported on Monday.
"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.
DPRK is short for the North's official name, the Democratic People's Republic of Korea.
While criticizing the US push for denuclearisation 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 threats.
Already in possession of nuclear-powered submarine?
Back in March, the North Korean news agency KCNA reported that the country would be building its first nuclear-powered submarine to enhance its nuclear weapons capabilities.
The news posted a photo showing the country's leader, Kim Jong-Un, inspecting what seems to be part of the submarine.
According to the state media, Kim Jong-Un, the general secretary of the Workers' Party of Korea and president of the State Affairs of the Democratic People's Republic of Korea, toured the shipyards "to give field guidance at their shipbuilding."
Jerusalem Post Staff contributed to this report.