The UK imported no fuel from Russia in June for the first time on record, according to official figures.
Imports of goods from Russia also fell to £33m in June, the lowest level since records began in January 1997, the Office for National Statics (ONS) said.
Western nations have imposed strict sanctions on Russia since it invaded Ukraine in February.
The UK has pledged to phase out Russian oil imports by the end of the year and gas imports as soon as possible.
Fuel imports from Russia fell by £499m - or 100% - compared with the average for the previous 12 months to February.
In 2021, the UK imported around 4% of its gas from Russia, and 11% of its oil, according to the International Energy Agency.
Exports of most goods to Russia had also decreased substantially by June, with machinery and transport equipment sales slashed by 91.3% to £118m.
Overall, exports to Russia dropped by almost 70%, to £168m, compared with the monthly average in the 12 months to February.
The only products to see a slight rise were chemicals, driven by an increase in exports of medicinal and pharmaceutical products, which are exempt from sanctions.
The ONS said that apart from government-stipulated sanctions, trade between Russia and the UK was lessened as businesses voluntarily sought alternatives to Russian goods.
The figures were released as Ukraine marked its day of independence, exactly six months since the Russian invasion began.
As a result of Russia's invasion, the EU has said it will cut gas imports from Russia by two-thirds within a year and has also agreed to ban all Russian oil imports which come in by sea by the end of the year.
Meanwhile, the US has imposed a total ban on Russian oil and gas imports.
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