Statement from Pyongyang comes after South Korea reported two more short-range missiles were tested by North Korea.
North Korean Foreign Minister Ri Yong Ho has called his American counterpart, Mike Pompeo, a “poisonous plant of American diplomacy”, vowing to “shutter the absurd dream” that US sanctions will force a change in Pyongyang.
Ri also accused Pompeo on Friday of casting “dark shadows” over the US-North Korea talks, claiming that the US diplomat was more interested in his own political ambitions than in current US foreign policy.
The North’s blistering rhetoric threatened to dim the possible resumption of nuclear negotiations between the countries.
Ri made the comments to protest Pompeo’s remarks in an interview, in which he said Washington will maintain crippling sanctions on North Korea unless it denuclearises.
Ri said he could not just let the “reckless remarks” by Pompeo pass by him because they came amid a possible restart of the nuclear talks.
Ri said Pompeo is a “brazen” man because he “had begged for” North Korean denuclearisation and improved bilateral ties when he visited Pyongyang and met leader Kim Jong Un several times.
On Thursday, a North Korean spokesman had said that Pyongyang has “no interest” in dialogue unless Washington stops “escalating hostile military moves”.
But South Korean deputy national security adviser Kim Hyun-chong indicated that he remained upbeat about the possibility of talks.
“My impression was that North Korea and the United States would carry out dialogue soon, and it would go well,” Kim told reporters in Seoul on Thursday.
The pair met again in June in the Demilitarised Zone and agreed to restart working-level dialogue, but those talks have yet to begin.
Meanwhile, North Korea has carried out several short-range missile tests in recent weeks in protest against annual US-South Korea joint military drills that it sees as a rehearsal for an attack.
On Wednesday, Stephen Biegun, the US’s special envoy for North Korea who leads the working-level talks, arrived in Seoul for three days of meetings that are expected to wrap up on Friday.
During his visit in the South Korean capital, Biegun said Washington is “prepared to engage” as soon as it hears from Pyongyang.
Washington stations nearly 30,000 troops in the South to defend it from its neighbour.
Earlier this month, Trump wrote on social media that Kim had sent him a letter – hand-delivered to him – in which he expressed hope that talks would resume “as soon as the joint U.S./South Korea joint exercise are over”.