“They should take measures of retracting the U.N. Security Council’s ‘resolutions on sanctions’ cooked up under absurd pretexts,” the Policy Department of the National Defense Commission, North Korea’s highest governing body, said in a statement carried by its official Korean Central News Agency. “They should give formal assurances before the world that they would not stage again such nuclear war drills to threaten or blackmail” the North, it added.

The statement demanded that Washington withdraw “all nuclear war means” from South Korea. It also said South Korea must stop making negative assertions about North Korea, such as its accusation blaming North Korea for a cyberattack that paralyzed the computer networks of South Korean broadcasters and banks last month.

It also taunted President Park Geun-hye of South Korea, saying that she should consider the North’s nuclear weapons “a property common to the nation.” Ms. Park has repeatedly said that nuclear weapons would only bring North Korea “self-destruction.”