Pompeo had been due to meet with North Korean official Kim Yong Chol Thursday in NY in a bid to jump start efforts to reach agreement on how to implement a promise to denuclearize the Korean Peninsula.
U.S. Secretary of State Mike Pompeo speaks to reporters during a news briefing at the State Department in Washington, U.S., October 23, 2018.
She did not specify why the talks had been canceled or if they had been rescheduled, only saying, "We will reconvene when our respective schedules permit".
Trump and Kim Jong Un's first meeting took place in Singapore earlier this year, but the talks that between the two sides since appear to have reached a stalemate.
Pompeo said earlier that he plans to discuss with his counterpart the North Korean leader's promise to allow worldwide inspectors into the nuclear testing site in Punggye-ri and the missile engine testing site in Dongchang-ri to verify their dismantlement.
Pompeo himself revealed in a Sunday interview that he expected some "real progress" in talks with Kim, including "an effort to make sure that the summit between the two leaders can take place". But the Blue House would not reveal the reason for the postponement, referring questions to the State Department.
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"Because over time, this negotiation will take a form where we're going to have to start making some changes to the military posture on the peninsula".
In addition to Pompeo's talks with his counterpart, the NY meeting in NY was expected to be the first between Trump's special North Korean envoy, Stephen Biegun, and his counterpart, Choe Son Hui.
"But I will say this, I will say this very simply - We are in no rush, the sanctions are on", he said. That effort has stalled, with North Korea refusing to declare the details of its nuclear capabilities or, so far, allow global inspectors into the country to verify claims that is has dismantled certain sites.
The North Korean statement warned North Korea could bring back Kim Jong Un's trademark "pyongjin" policy of simultaneously advancing its nuclear force and its economic development if the United States doesn't change its stance.
In Seoul, South Korean presidential spokesman Kim Eui-kyeom said that his government doesn't believe U.S. It also has returned the remains of US troops killed in the 1950-53 Korean War.
Woo Yoon-keun, the South Korean ambassador to Russian Federation, said that although North Korea and Russian Federation may not have reached an agreement on Kim's visit, the trip could happen by this month " in consideration of several circumstances", Yonhap News Agency reported. -China diplomatic and security dialogue in Washington on Friday.