Ukraine has targeted Russia with hundreds of drones, sparking a brief fire at the vast northwest Kirishi oil refinery, Moscow says.

No injuries were reported in the attack, Russian officials said on Sunday.

The drone war has escalated as big powers talk about how to end the deadliest conflict in Europe since World War II, with Russian drones downed in NATO-member Poland and attacks by Ukraine against oil refineries and pipelines in Russia, the world's second biggest oil exporter.

Russia's defence ministry said at least 361 drones had been shot down by Russian air defence systems, including four guided aerial bombs and a US-made HIMARS missile.

It did not give details about the location of the attacks.

Surgutneftegaz's Kirishinefteorgsintez refinery, one of the top two refineries in Ru

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