Vice Foreign Minister Choe Son Hui said on Saturday North Korea's policy wouldn't change and U.S. negotiations will not continue.
President Donald Trump said he thinks North Korea's Kim Jong Un is a "man of his word" after the despot warned the world that Pyongyang will soon have a "new strategic weapon."
North Korea has set an end-of-year deadline for U.S. officials to break the deadlock in denuclearization talks, or receive a "Christmas gift."
The former national security advisor said he does not think North Korea will ever voluntarily surrender its nuclear weapons, regardless of what Kim Jong Un tells Trump.
Special envoy Stephen Biegun said that any new weapons tests or provocations by the North would be "most unhelpful" with negotiations stalled.
The U.S. urged fellow Security Council members to "act accordingly" in response to threats or provocation from Pyongyang amid stalled denuclearization talks.
The president touted his relationship with the North Korean leader despite tensions escalating as Kim Jong Un imposed a deadline for denuclearization talks.
Little of note has been achieved in the 18 months since President Donald Trump and Kim Jong Un signed a vague agreement on denuclearization in Singapore.
North Korea has lodged multiple protests over planned joint U.S.-South Korean war games, and said Wednesday it would respond to force in kind.
Pyongyang warned that the planned aerial drill will "throw a wet blanket" on struggling negotiations.
North Korea fired two missiles into the sea off its eastern coast on Thursday as denuclearization negotiations with the U.S. remain stalled.
Pyongyang tested the Pukguksong-3 ballistic missile on Wednesday, ahead of the resumption of disarmament talks with the U.S. this weekend.
The test came just one day after the North announced it would resume denuclearization talks with the U.S. this weekend.
Pyongyang has conducted seven rounds of short-range missile tests since July with denuclearization talks with the U.S. in limbo.
Reports suggested the new submarine may have been designed to carry and launch ballistic missiles, which could in future be tipped with nuclear warheads.
"He has not curbed his use of nuclear weapons and missiles as he said he would," former U.S. ambassador to the UN Bill Richardson said.
Love letters between the leaders won't end seven decades of war, and the sides are running out of time.
"This is a ruthless dictator and when you go forward, you have to have clear focus and a clear mission and clear goals," said the senator.
Relations between Washington and Pyongyang look far less promising than they did one year ago, with denuclearization negotiations stalled since the collapse of the Hanoi summit.
"The more the U.S. hostile acts towards the DPRK grow, the stronger our countermeasures will become," the nation's foreign ministry warned.
The North Korean foreign ministry demanded the U.S. abandon its "current way of calculation" if it wished to revive bilateral talks.
"No water came out of the showers, faucets were missing and lights were not set up properly," Kim complained of facilities at a youth center.
"If he's working towards a deal, as you say, it's a deal we don't know about," John Brennan said. "He basically said he wants denuclearization. That is not going to happen."
The Wise Honest was seized in Indonesia earlier this month.
"Thus far what you've seen this president do is heap praise on Kim Jong Un and kind of revel in the spectacle of these summits, where nothing happens," said Ben Rhodes, former deputy national security adviser to Barack Obama.
The North Korean leader also reportedly commanded troops to be at "high alert posture" and to prepare to "defend the political sovereignty and economic self-sustenance of the country."
The talks will be aimed at achieving the final fully verified denuclearization of North Korea, a senior administration official said Thursday.
Kim Yeon-chul said economic leverage should be used to encourage denuclearization progress.
Senator Chris Murphy, a Connecticut Democrat, told The Atlantic the president "went for the whole enchilada and lost badly."