The North Korean delegation said it used to be responding to a USA allegation that it had breached a cap on refined petroleum imports that used to be position in 2017.
Just a day before that visit, the USA was involved in a joint letter calling for all United Nations member states to expel all North Korean workers.
Mr Kim accepted, and at their Sunday meeting Mr Trump became the first sitting U.S. president to set foot in North Korea when he crossed the demarcation line.
But there was nothing positive in Wednesday's statement from North Korea's UN Mission, which made no mention of nuclear talks, focusing instead on sanctions.
The mission said the letter from the United States, along with Britain, France and Germany, was sent on June 29, the day Trump tweeted that he would like to shake Kim's hand and say hello during his visit to the demilitarized zone on the Korean peninsula.
Media reports say North Korea has picked its former ambassador to Vietnam, Kim Myong-gil, as its new chief nuclear envoy who'll be the counterpart of the U.S. Special Representative for North Korea, Stephen Biegun.
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Gause, a leading North Korea analyst at the Virginia-based non-profit think tank, backed the idea that the North's Foreign Ministry leapfrogged over the United Front Department (UFD) to take charge of the country's engagements with the United States following the collapse of the second U.S.
He turned the first sitting United States president to situation foot within the North and, after talks that lasted for almost an hour, the pair agreed to situation up groups to renew stalled negotiations on denuclearisation.
"Our state is not a country that will surrender to the U.S. sanctions", a North Korean foreign ministry official said in a statement last week.
Pyongyang added that it used to be "slightly ridiculous" for the USA to gaze sanctions as a "panacea for all problems".
Trump claimed that Obama, also wanting to meet with Kim, called the North Korean leader on "numerous occasions", but was rejected.
But those talks ended with no deal, as they failed to agree on the pace at which sanctions should be eased. The Chosun Ilbo reported that Kim's negotiating team at the DMZ, including the interpreter, differed from the one he had in Hanoi. When Donald Trump and Kim Jong Un met on Sunday at the demilitarised zone, their exchanges were largely complimentary.
Mr Trump - who once referred to Mr Kim as "minute rocket man" - known as their friendship "particularly good" and said it was a "whats up for the arena".