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Russian overnight strikes on Ukraine’s energy grid left more than 850,000 people without power on Sunday, as temperatures across the country hover around freezing.

Getting into it: Ukrainian energy company DTEK said more than 600,000 people in the eastern Dnipropetrovsk region, including the city of Dnipro, lost electricity after an attack damaged key energy facilities, and that repairs were being slowed by repeated strikes. Another 250,000 customers lost power in the northeastern Kharkiv region, though local officials later said it had been restored, and President Volodymyr Zelensky said 140 apartment buildings in the Zhytomyr region were left without heat.

A day earlier, Ukraine’s energy ministry said a large-scale attack had cut power in five regions and disrupted electricity in Kyiv. A separate strike on a residential area of Dnipro killed one person and injured three. Zelensky also said Russia hit Komyshuvakha with a drone, the Zaporizhzhia village where rescuers are still searching the rubble a week after a Russian strike on an aid distribution site killed 55 people, just days after the temporary ceasefire around Oleshky ended.

Ukraine’s emergency service said no one was hurt in the Komyshuvakha drone strike. Russia’s Defense Ministry said it struck two substations powering Ukrainian defense plants and three cargo ships it claims were carrying weapons and military equipment to the ports of Odesa and Chornomorsk.

This all comes as Zelensky says Russia is stepping up strikes to squeeze Ukraine before US-brokered talks with Moscow and Washington in Abu Dhabi on Tuesday and Wednesday, while Ukraine struggles with a shortage of air defense interceptors heading into winter.