"We will reconvene when our respective schedules permit".
State Department officials gave no further reasons for the delay to the meeting, although North Korea has stepped up its demands that the United States lift sanctions.
The meeting had been scheduled to take place in NY on Thursday as the two sides continue talks on North Korea's denuclearization and a potential second summit between U.S. President Donald Trump and North Korean leader Kim Jong-un.
Last week, the North's foreign ministry threatened to return to Pyongyang's former policy of "byeongjin", which calls for simultaneously developing its nuclear program and economy, if the us did not start lifting sanctions. "Ongoing conversations continue to take place", Nauert said.
"What remains to be done is the U.S. corresponding reply", it added.
"I'm confident that we'll advance the ball again this week when I'm in New York City", he told CBS's "Face the Nation".
But Yang Moo-jin, a professor at the University of North Korean Studies in Seoul, said that the postponement was a bad sign.
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Pyongyang's former spymaster and has been Pomepeo's counterpoint through most of the US-North Korea negotiations in 2018.
The two sides are also expected to continue planning for a second summit between Trump and Kim early next year.
"Russia requested consultations on the topic of sanctions against North Korea during tomorrow's general consultations at UN SC".
South Korea's presidential office said the government would later announce its stance over the postponed meeting, but South Korean news agency Yonhap said South Korean officials were notified by the US of the postponement before it was announced in Washington. Moon's office said the US notified the government of the delay before the public announcement.
South Korean foreign minister Kang Kyung-wha said on Thursday the North had suggested a postponement.
"There have been cases in the past when US-North Korea talks were delayed, so there is no need to shift between hope and fear", a senior ministry official told reporters.
JS Tours has also offered a new five-night, six-day tour package bound for Mount Paekdu, saying Moon and Kim had a commemorative photo together at the Chonji crater lake on top of the North Korean mountain, according to RFA.
"Russia has indeed asked for discussing the issue of North Korean sanctions during tomorrow's USNC consultations as part of the "Miscellaneous" section [of the agenda] ..."