The UN Independent International Commission of Inquiry on Ukraine reported that Russia committed war crimes and crimes against humanity by intentionally attacking Ukraine's civilian energy infrastructure

From the articleUN panel: Russia is committing crimes against humanity by targeting civilians in Ukraine | CNNAlso in Russia committed war crimes in Ukraine by attacking energy grid: UN-backed inquiry, Russia's assault on Ukraine's energy grid is a war crime, UN says, Russian attacks on Ukraine’s energy infra amount to ‘war crimes’—UN report