Still, Russian supplies in July, equivalent to about 1.68 million barrels per day (bpd), were below May's record of close to 2 million bpd. China is Russia's largest oil buyer.

Imports from second-ranking Saudi Arabia rebounded last month from June, which was the lowest in more than three years, to 6.56 million tonnes, or 1.54 million bpd, but still slightly below year-ago level.

Year-to-date imports from Russia totalled 48.45 million tonnes, up 4.4 per cent on the year, still trailing behind Saudi Arabia, which supplied 49.84 million tonnes, or 1 per cent below the year-ago level.

China's crude oil imports in July fell 9.5 per cent from a year earlier, with daily volumes at the second lowest in four years, as refiners drew down inventories and domestic fuel demand recovered more slowly than expected.

The strong Russian purchases squeezed out competing supplies from Angola and Brazil, which fell 27 per cent year-on-year and 58 per cent, respectively.

Customs reported no imports from Venezuela or Iran last month. State oil firms have shunned purchases since late 2019 for fear of falling foul of secondary US sanctions.

Imports from Malaysia, often used as a transfer point in the past two years for oil originating from Iran and Venezuela, soared 183 per cent on the year, to 3.34 million tonnes, and up from June's 2.65 million tonnes.