WASHINGTON — North Korean state media criticized the United States over the weekend for “extremely provocative and dangerous military moves” in Pacific waters and warned that the diplomacy forged between the two countries’ leaders during their Singapore summit meeting in June could be in jeopardy.

The belligerent articles were the first official comments from North Korea since a frustrated President Trump announced on Friday that Secretary of State Mike Pompeo was canceling his most recent plan to travel to Pyongyang, the North Korean capital.

Mr. Trump’s announcement, made in a series of tweets, was the first acknowledgment by the American president that the diplomatic process with North Korea had stalled.

He said the United States had not been making “sufficient progress” on getting North Korea to halt or dismantle its nuclear weapons program, and blamed China for the slow progress. Some American officials and analysts in Beijing, however, have said China generally has adhered to an American-led economic sanctions plan against North Korea.