Ukraine was scrambling to turn lights and heating back on Sunday after Russian attacks targeting energy infrastructure, which had crippled some of the country’s power generation.

Moscow, which has escalated attacks on Ukraine’s infrastructure in recent months, launched hundreds of drones at energy facilities across the country overnight into Saturday.

Ukrainian strikes on Russia’s own infrastructure meanwhile left more than 20,000 people without power in regions bordering Ukraine, local authorities said.

The Russian attacks interrupted electricity, heat and water supplies in several cities.

The strikes affected power plants of Centrenergo, one of Ukraine’s power generating companies.

The company website says it used to power 15 percent of Ukraine with three power plants — one of which

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