Ukrainian officials have warned that Russian forces are preparing a fresh wave of missile attacks targeting energy infrastructure.
This comes after President Volodymyr Zelenskyy also said in an address to Ukrainians late on Sunday that Russia was preparing new aerial attacks.
He said Russia's military would continue such attacks "as long as they have missiles."
Repeated Russian attacks in recent days have disrupted power and water supplies to millions over recent weeks as winter sets in.
Russia has said it targets only infrastructure linked to military use and has blamed the blackouts on Kyiv's refusal to negotiate with Moscow.
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