Russia ships 2,100 tons of refined oil to N. Korea in Sept. | Yonhap News Agency
최수향
SEOUL, Nov. 20 (Yonhap) -- Russia exported 2,136 tons of refined oil to North Korea in September, a U.N. website showed Wednesday.
The tally is slightly down from 2,612 tons shipped from Russia to the North in the previous month, according to monthly reports submitted to the U.N. committee handling sanctions on the North.
Read more at: https://en.yna.co.kr/view/AEN20191120002600325?section=nk/nk
Seeing the rest of the article, apparently, some oil and gas being shipped to North Korea is acceptable and within the sanctions limit.