"I would love to take the sanctions off, but they have to be responsive too".
Kim pledged to work toward denuclearization at an unprecedented first meeting with Trump in Singapore but negotiations have made little headway since, with North Korea falling short of US demands for irreversible moves to abandon a weapons program that potentially threatens the United States.
North Korea - considered by human rights groups to be one of the most oppressive regimes in the world - has for years sought formal United States recognition as a way to guarantee the regime's survival.
Russian Federation said in October it was time to consider the possibility of relaxing the global restrictions against Pyongyang amid commitment expressed by North Korea's leadership to denuclearize of the Korean Peninsula.
"This last-minute announcement of a delay is not a good signal as it indicates negotiations were not going well enough to go ahead with the planned meeting", he said.
Seoul's Foreign Ministry also expressed hope that the US and North Korea can quickly reschedule a high-level meeting.
To that end, the USA and South Korea announced last week the creation of a new working group to "strengthen our close coordination", including on "sanctions implementation and inter-Korean cooperation that comply with the United Nations sanctions", according to State Department deputy spokesperson Robert Palladino.
Instead of following through on that, in recent days North Korea has been criticizing the USA over its sanctions, threatening last Friday to bring back its "byongjin" policy - advancing its nuclear arsenal and economic development at the same time.
"You could have a situation that South Korea and North Korea come to some kind of agreement and then suddenly there's an expectation that we would fall into line with that we would be willing to put scarce budget dollars into helping North Korea economically, you know, without having laid the groundwork or gotten enough concessions to make that possible", Kenney said at an Asia Society event that discussed USA policy toward Asia after the midterm elections.
Before that he also called off the Singapore summit before putting it back on.
The diplomacy on North Korea has seen a series of fits and starts, with Trump at one point scrapping a trip by Pompeo just as he was set to fly to Pyongyang.
Pompeo was supposed to travel to NY on Thursday to meet with his North Korean counterpart, Kim Yong Chol.
"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.
Speaking at a regular press briefing, State Department deputy spokesperson Robert Palladino emphasized that the postponement was "purely a matter of scheduling".