SEOUL, South Korea — North Korea said on Saturday that its expectations for more dialogue with the Trump administration were “gradually disappearing,” and threatened to reconsider its conciliatory gestures toward the United States, potentially including its moratorium on nuclear and long-range missile tests.

The warning was contained in a statement issued by First Vice Foreign Minister Choe Son-hui, which accused Secretary of State Mike Pompeo of blocking efforts to restart dialogue.

Ms. Choe was the second senior North Korean official in a week to attack Mr. Pompeo, this time over a speech on Tuesday in which he said the administration had “recognized North Korea’s rogue behavior could not be ignored.”

That remark “made the opening of the expected D.P.R.K.-U.S. working-level negotiations more difficult,” Ms. Choe said, using the abbreviation of the North’s official name, the Democratic People’s Republic of Korea. “Our expectations of dialogue with the U.S. are gradually disappearing, and we are being pushed to re-examine all the measures we have taken so far.”