It was previously reported that the US proposed sanctions to North Korea for violation of the petrochemical limit imposed were to be adopted.
The reported information noted that US official held prior consultations with Chinese and Russian representatives in order to endure that sanctions will be approved.
Nonetheless, the meeting of the security council of the UN ended with Russia and China blocking the proposed sanctions.
Source
https://www.riskscreen.com/kyc360/news/russia-china-block-un-from-saying-nkorea-violated-sanctions/