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... The Reuters calculation is some of the first concrete evidence of a windfall for Russia, the world's second-largest oil exporter, from the Iran war, which oil traders say has triggered the most serious energy crisis in recent history.

Iran effectively shut the Strait of Hormuz -- a route for about a fifth of global oil and LNG flows -- after U.S. and Israeli airstrikes on Iran at the end of February, sending Brent futures shooting well past $100 per barrel.

Russia's main revenue from its vast oil and gas industry is based on production. Export duty on crude oil has been nullified from the start of 2024 as part of the so-called wider tax manoeuvre, a years-long tax reform of the industry.

According to Reuters calculations based on preliminary production data and oil prices, Russia's mineral extraction tax on oil output will increase in April to around 700 billion roubles ($9 billion) from 327 billion roubles in March. The revenue is up by some 10% from April last year. ...