North Korea accused the United States on Thursday of using the North’s nuclear program as an excuse to mask its own opposition to banning nuclear weapons.

Ri Song Chol, a counsellor at North Korea’s U.N. mission, told The Associated Press that the United States drove his country to make and possess nuclear weapons to defend itself against any American aggression.

He said the United States was the first country to use nuclear weapons — against Japan during World War II — and it continues to use them “to threaten and blackmail other countries” including North Korea.

Ri said he was responding to U.S. Ambassador Nikki Haley who said Monday that the United States wouldn’t participate in U.N. talks aimed at banning nuclear weapons because “bad actors” wouldn’t sign or comply with a potential treaty.

“North Korea would be the one cheering, and all of us and the people we represent would be the ones at risk,” Haley said.

Haley was speaking before the start of U.N. talks aimed at eventually producing a treaty banning nuclear weapons.

The five nuclear powers — the United States, Russia, China, Britain and France — refused to attend the meeting saying a ban won’t work and the world should instead stick with a more gradual approach.

Ri said his country, the Democratic People’s Republic of Korea or DPRK, supports the global effort to eliminate nuclear weapons, but won’t give up its weapons “until the denuclearization of the world is implemented.”