WASHINGTON — American negotiators have confronted North Korean officials over “suspected” secret nuclear facilities, according to a North Korean state news media commentary, which called the Trump administration accusations “fiction” and said they had led to “derailing dialogue” between the two nations.

The piece, published over the weekend by Rodong Sinmun, the official newspaper of the Central Committee of the Workers’ Party of Korea, marks the first indication that American officials have pointed out specific nuclear sites to North Korean negotiators and, presumably, asked Pyongyang to shut them down.

Despite laudatory statements by President Trump, North Korea has not agreed to any concrete steps to end its nuclear weapons program. American officials have concluded that North Korea is still producing fissile material and, according to news reports, continuing to make long-range missiles at a site north of Pyongyang, the capital.

The commentary also beseeched Mr. Trump to hold onto his “dream” of improving relations — what it described as an “epoch-making cause” — and push aside people in his administration who are trying to throw that mission off track.