U.S. Secretary of State Mike Pompeo abruptly shelved plans to travel to NY on Thursday to meet with his North Korean counterpart Kim Yong Chol.
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".
While U.S. and South Korean officials had expressed hope the talks could make some progress - including laying the groundwork for a second Trump-Kim meeting - North Korea has in recent weeks stepped up calls for sanctions relief.
"What remains to be done is the USA corresponding reply", it added.
North Korea's Foreign Ministry said the US President Donald Trump's administration had failed to understand its repeated demand.
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The meeting comes with the two sides at loggerheads almost five months after the summit, in which Trump and Kim pledged to work toward the denuclearisation of the Korean peninsula. -North Korea negotiations have completely broken down or "lost their momentum" because of the postponement. "We're in no hurry", Trump told reporters at a White House press conference.
Washington briefed Seoul about the postponement ahead of the announcement, this official added.
In contrast to Washington's approach, the South's dovish president Moon Jae-in, who brokered the Singapore summit, has dangled large investment and joint cross-border projects as incentives for steps towards denuclearization. South Korea's foreign ministry said it was not aware of Ri's visit.
Pompeo was supposed to travel to NY on Thursday to meet with his North Korean counterpart, Kim Yong Chol.
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.
"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] ..."
The latest NY meeting was set to come ahead of a busy season of diplomacy, with Pompeo meeting senior Chinese officials in Washington on Friday.