A senior North Korean diplomat said Saturday the expectation that dialogue with the United States will resume is "gradually disappearing" after U.S. Secretary of State Mike Pompeo described the country's behavior as "rogue."

"Pompeo has gone so far in his language and it made the opening of the expected DPRK-U.S. working-level negotiations more difficult," First Vice Foreign Minister Choe Son Hui said in a statement carried by the Korean Central News Agency, using the acronym for North Korea's official name.

"We are being pushed to re-examine all the measures we have taken so far," Choe said.

Pompeo said in a speech to a veterans organization Tuesday that Pyongyang's "rogue behavior could not be ignored."

North Korea, meanwhile, has notified the United Nations that the nation's ambassador-level official will deliver a speech at the upcoming U.N. General Assembly, a source close to the matter said, indicating Pyongyang may cancel Foreign Minister Ri Yong Ho's participation.

Ri's potential absence from the U.N. gathering, scheduled to be held in New York in late September, would deprive Pompeo of a chance to make contact with his North Korean counterpart.

At their June 30 meeting at the inter-Korean truce village of Panmunjeom, U.S. President Donald Trump and North Korean leader Kim Jong Un agreed that Washington and Pyongyang would resume stalled denuclearization talks within weeks, but they have yet to take place.

Instead, North Korea has repeatedly launched new weapons in recent months. Last Saturday, it fired two projectiles believed to be short-range ballistic missiles into the Sea of Japan, in Pyongyang's seventh round of such launches since July 25.