U.S. Ambassador to the United Nations Nikki Haley claimed Russian Federation meddled with a report by a UN panel of experts on sanctions on North Korea, widening the schism between the two veto-wielding countries of the 15-member Security Council.
"They are systematic", Haley told the 15-member council.
Since the historic Singapore summit between U.S. President Donald Trump and North Korean leader Kim Jong-un in June, Pyongyang has called for an easing of the sanctions in return for steps toward denuclearization.
In addition to illegal oil transfers, the report called out Chinese firms for buying iron, steel, and other banned products from North Korea and maintaining illegal business partnerships with North Korean operations.
On the heels of Haley's security council remarks, Secretary of State Mike Pompeo wrote on Twitter that Russian Federation is actively undermining compliance with North Korea sanctions.
Haley said earlier this year that successively tough Security Council sanctions resolutions adopted unanimously had cut off all North Korean exports, 90 percent of its trade, and disbanded its pool of workers send overseas to earn hard currency.
"We must not soften the sanctions regime at the global level", on the contrary, said Nikki Haley. She said that the International Atomic Energy Agency (IAEA) is still unable to gain access to the country and inspect nuclear-related facilities.
The United States on Monday accused Russian Federation of "cheating" on UN sanctions against North Korea with a planned railway project, oil transfers and ongoing business dealings with Pyongyang.
The U.S. Mission announced Friday evening that the meeting will 'discuss the implementation and enforcement of United Nations sanctions on North Korea'.
The sanctions "are not an a la carte menu where each piocherait according to its appetites", said the French ambassador, François Delattre.
He said Russian Federation had asked for further information from the United States on the North Korean national.
Monday's meeting, called for by the USA, came on the eve of a high-stakes inter-Korean summit in the Pyongyang.
The Russian envoy said the work of the Panel of Experts had become "increasingly politicised" and that the first version of the report did not meet the required standards of objectivity and impartiality. Last month, Trump cancelled Secretary of State Mike Pompeo's planned visit to Pyongyang, hours before the diplomat was due to leave, because Trump felt the talks were not making "sufficient progress", he tweeted.
"This council should stay united, honor its responsibility entrusted by history and push for the denuclearization and lasting peace in northeast Asia", Ma said.