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Ukrainian President Volodymyr Zelensky said on Twitter on Tuesday that in the past eight days, 30% of Ukraine's power stations had been destroyed, "causing massive blackouts across the country".

Russia has stepped up attacks in recent weeks on electricity infrastructure in cities away from the front lines. Officials have rushed to repair the damage, but the strikes, ahead of winter, have raised concerns about how the system will respond.

His government's First Deputy Minister of Internal Affairs, Yevhen Yenin spoke to Newsday, calling the attacks "sabotage against the civilian population" in a bid to force his country into negotiations with Moscow.

(Photo: Firefighters work to put out a fire in a thermal power plant, damaged by a Russian missile strike in Kyiv Credit: State Emergency Services of Ukraine/Reuters)