Pompeo said the USA will need to see concrete actions from Pyongyang before the sanctions can be eased. French Ambassador Francois Delattre said both Pompeo and Kang sought to "confirm the unity and firmness of the Security Council in the full implementation of the sanctions".
The security adviser, who met with his USA counterpart John Bolton on Friday, said that the two sides reaffirmed that they have a common goal of establishing peace on the Korean Peninsula through complete denuclearization.
President Trump has repeatedly declared his summit last month in Singapore with North Korean leader Kim Jong Un a success.
Benjamin Katzeff Silberstein, an associate at the Foreign Policy Research Institute who tracks the North Korean economy, said increasing economic penalties seemed to be the main cause of the decline.
US Ambassador Nikki Haley made clear that the best way to support US diplomacy on North Korea was "to not loosen the sanctions". The sanctions committee has what it needs. He warned that "when sanctions are not enforced, the prospects for the successful denuclearization of North Korea are diminished".
There is no evidence North Korea has made any concrete moves toward dismantling its nuclear weapons program so far.
However, as days have passed by, American negotiators have faced it increasingly hard to turn the words into action, thanks to stiff resistance from the East Asian country and it has left Trump aghast, so much so that he has fumed at his aides privately even as he praised the negotiations in public, The Washington Times reported.
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"The negative growth is attributable to a drop in its mining output and a retreat in its heavy and chemical industries, as the United Nations imposed tougher sanctions over its nuclear and missile activities", one official told South Korea's Yonhap news agency.
"The Foreign Minister and the Secretary of State discussed the situation inside Syria and beyond [its borders], including possible cooperation of Russian Federation and the United States alongside other countries in solving humanitarian problems in the Syrian Arab Republic and the tasks aimed at backing the efforts to advance denuclearization of the Korean Peninsula", the ministry said.
"Given that the South Korean government also has an obligation to carry out what was agreed upon in the Panmunjom Declaration, it should not sit idle on the issue of declaring an end to the war", said Uriminzokkiri, the North's external propaganda website, in English, referring to the April summit agreement.
"It's really pretty straightforward, right", Pompeo said. "And so until that action happens, the Security Council is going to hold tight".
United States documents sent to the sanctions committee and obtained by The Associated Press cite 89 instances between January 1 and May 30 in which North Korean tankers likely delivered refined products "illicitly procured" via such transfers.
"We will hold them up to that commitment", she said.
Those sanctions, which came amid a flurry of a missile tests and escalating rhetoric, included China's decision to completely ban imports of North Korean coal, iron and sea food as part of a volley of United Nations sanctions.