Dozens have been injured in a "savage" Russian drone strike on a Ukrainian railway station, Ukrainian President Volodymyr Zelenskiy says, as Moscow steps up strikes on Ukraine's rail and power grids before the fourth winter since its all-out invasion.

At least 30 people suffered injuries, Zelenskiy said of the attack on Shostka, a city northeast of Kyiv that lies 70km from the Russian border.

"All emergency services are already on the scene and have begun helping people. All information about the injured is being established," he said in a post on X.

Russia struck two passenger trains in quick succession, first targeting a local service and then one bound for Kyiv, said Oleksiy Kuleba, Ukraine's deputy prime minister and reconstruction minister.

"Medical teams have already transported

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