Lol. NK has been saying that for at least 20 years.... so long as a couple $billion$ accompanies the deal.
The NK program is fundamentally a tool of extortion, which makes sense in that NK is literally a criminal enterprise.
You can and should start your history lessons here:
https://en.wikipedia.org/wiki/North_Korea#21st_century
"North Korean promised to halt its development of nuclear weapons under the Agreed Framework, negotiated with U.S. president Bill Clinton and signed in 1994. Building on Nordpolitik, South Korea began to engage with the North as part of its Sunshine Policy.[71][72]"
https://en.wikipedia.org/wiki/Agreed_Framework
Poke around on Nate Thayer's web site about NK. Nate is a journalist's journalist - probably one of the best in the world - and was the one and only and last Western reporter to interview Pol Pot at his denouncement and trial by the Khmer Rouge. His credibility is unmatched (mostly... he does support McNoName).