Officials in Russia and Ukraine have both reported deaths and injuries following attacks.
Ukraine’s President Volodymyr Zelensky said the country’s military had hit two Russian oil refineries in "long-range" attacks.
Russia’s Yaroslav region has counted four injured in an attack on the Slavneft-Yanos oil refinery after huge clouds of smoke were seen over the city.
Russia’s regional governor in Yaroslavl called it the "largest ever attack by enemy drones", saying 93 drones had been destroyed, but oil storage tanks had been hit by falling debris.
Across Russia, the military said it had intercepted and destroyed 605 Ukrainian drones in multiple regions, including Yaroslavl.
In Ukraine, officials said three people had been killed in a Russian drone attack on a residential area.
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