SEOUL, South Korea — North Korea on Thursday threatened to resume calling President Trump bad names, including a “dotard,” two days after he again called its leader “Rocket Man” and raised the possibility of using military force.

North Korea’s first vice foreign minister, Choe Son-hui, said that if Mr. Trump deliberately stoked “the atmosphere of confrontation” once again, then that “must really be diagnosed as the relapse of the dotage of a dotard.”

Ms. Choe issued her statement, which was carried by the official Korean Central News Agency, in response to remarks Mr. Trump made in London on Tuesday, on the sidelines of his meetings with NATO leaders.

“We’re by far the most powerful country in the world,” Mr. Trump said, urging North Korea’s leader, Kim Jong-un, to honor his promise to denuclearize. “And, hopefully, we don’t have to use it, but if we do, we’ll use it.”