A dramatic rise in Ukrainian attacks on Russian oil refineries has sent gasoline prices in Russia to record highs, despite the government banning petrol exports to cope with the crunch.

Ukraine is focusing drone attacks on refineries, pumping stations and fuel trains in an effort to hurt the Russian war machine - but also to disrupt daily life in Russia. Summer sees peak demand among Russia’s drivers and farmers for petrol.

Ukrainian drones have struck at least ten key Russian energy facilities this month alone, according to a CNN tally of attacks.

And the strategy seems to be working. The refineries struck account for more than 44 million tons of products annually – more than 10% of Russia’s capacity - according to Ukraine’s intelligence service.

Among the targets - the giant Lukoil r

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