Here is another angle, another loophole you can drive a truck through, that they are exploiting now that the policy of maximum pressure is off replaced by detente and pleasantries. But at least Pompeo appears to be hep to it (today):
“SINGAPORE—Secretary of State Mike Pompeo said the U.S. would raise concerns with Moscow about allegations that Russia has been flouting United Nations sanctions on Pyongyang by doing business with North Korean firms and employing its workers.
Speaking to reporters on the sidelines of a series of meetings with Asian nations in Singapore, Mr. Pompeo said the U.S. is aware of reports that Russia had been allowing North Koreans to do business. “If these reports prove accurate, and we have every reason to believe that they are, that would be in violation” of U.N. resolutions, he said, reminding other nations “that this is a serious issue and something that we will discuss with Moscow.”
Gosh what is this world coming to? The Russians won’t do us favors while we’re in the middle of increasing sanctions against them? How weird. Who could have predicted that? /s