An executive from China's Dongming Petrochemical Group, an independent refiner from Shandong province of China, says the refinery has stopped purchase of crude oil from the US and is going to buy crude from Iran.

The committee overseeing the OPEC/non-OPEC supply agreement will assess how the coalition complies with its aim of bringing "overall conformity levels" down to 100%, UAE energy minister Suhail al-Mazrouei said in a letter to Iranian counterpart Bijan Zanganeh.