The exact reason for the postponement was unclear.
Trump suggested at a news conference Wednesday that a meeting between Pompeo and his North Korean counterpart, Kim Yong Chol, that was supposed to take place Thursday in NY would be rescheduled because of a conflict that he didn't explain.
The meeting, scheduled for this week in NY, she said, "will reconvene when our respective schedules permit". "But North Korea seems to be weighing the time and place while looking into the agenda and possible agreement with Russia", Woo said.
US President Donald Trump said on Wednesday (Nov 7) he hoped to meet again early next year with North Korean leader Kim Jong Un but that he was in "no rush" to negotiate.
This graphic image shows U.S. Secretary of State Mike Pompeo (R) meeting with Kim Yong-chol, vice chairman of North Korea's ruling Workers' Party's Central Committee, in NY in May 2018.
Mike Pompeo was subsequently commissioned to negotiate, especially with Kim Yong Chol, a senior north Korean leaders, the content and timing of this commitment is still vague.
When asked about the cancellation on Wednesday, Trump said, "We're going to change it because of trips that are being made".
Trump has cast North Korea as a crowning diplomatic achievement and is eager for a fresh summit with Kim at which the two may formally declare an end to the 1950-53 Korean War.
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But in Seoul, Yang Moo-jin, a professor at the University of the studies of north korea, has seen a bad sign in this report.
Pompeo had been due to hold talks in NY on Thursday with senior North Korean official Kim Yong Chol aimed at paving the way for a second summit between Trump and Kim Jong Un and at making progress on denuclearization.
Russian Federation said in October it was time to consider the possibility of relaxing the worldwide restrictions against Pyongyang amid commitment expressed by North Korea's leadership to denuclearize of the Korean Peninsula.
South Korean foreign minister Kang Kyung-wha said on Thursday the North had suggested a postponement.
Kim Yong-chol had been booked for a flight from Beijing to NY on Wednesday.
FILE - Journalists look around the third tunnel of Punggye-ri nuclear test ground before it is blown up during the dismantlement process in Punggye-ri, North Hamgyong Province, North Korea, May 24, 2018.
The first summit yielded a joint statement committing the North to work toward "complete denuclearization" of the Korean Peninsula in exchange for security guarantees from the U.S.
News of the postponement came after North Korea's Foreign Ministry criticized the US on Friday for its continued support of sanctions and hinted it may resume nuclear development. He visited NY in May for talks with Pompeo in what was the highest-level trip by a North Korean to the United States in almost two decades.