(LONDON) — Millions of Ukrainians have been plunged into frequent darkness and cold as Russian drones and missiles wage a systematic long-range campaign against the country’s energy grid for the fourth consecutive winter.

Even at the offices of Ukraine’s mammoth state-owned Naftogaz oil and gas conglomerate in Kyiv, emergency generators have been keeping the lights on.

“What I can see from my window — there is an absolutely dark city with only some lights,” CEO Sergii Koretskyi told ABC News during a video interview. “I’m sure people recognize this winter as the most difficult since the full-scale invasion started. We can see power cuts from four up to 10 hours a day.”

Russia’s nightly bombardments have increasingly targeted energy infrastructure in recent months, Ukrainian officials sa

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