A man takes a photo of an artwork that was made by British street artist Banksy on a building destroyed by the Russian army in Borodyanka, Kyiv region, Ukraine, Tuesday, Dec. 6, 2022. (AP Photo/Efrem Lukatsky)

A flock of crows flies over downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

A woman looks at Podil district of Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

People walk down a street in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

People walk down a street in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

People walk down a street in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

A man walks down a street in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

People walk down a street in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

A woman walks at Kyiv's "Maidan" Independence Square on December 6, 2022. (Photo by Dimitar DILKOFF / AFP)

A waiter carries a candle in a restaurant during a power cut in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

A couple eat by candle light in a restaurant during a power cut in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

Candles light a restaurant during a power cut in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

Candles light a restaurant during a power cut in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

A couple eat by candle light in a restaurant during a power cut in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

A chef cooks on a wood stove in a restaurant during a power cut in downtown Kyiv on December 6, 2022, amid the Russian invasion of Ukraine. - With temperatures dipping below zero, repeated Russian attacks have left Ukraine's energy grid teetering on the brink of collapse and have disrupted power and water supplies to millions over recent weeks. (Photo by Dimitar DILKOFF / AFP)

People rest in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

People rest in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

People rest in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

People rest in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

People rest in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

People rest in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

People work in the subway station being used as a bomb shelter during a rocket attack in Kyiv, Ukraine, Monday, Dec. 5, 2022. Ukraine’s air force said it shot down more than 60 of about 70 missiles that Russia fired on in its latest barrage against Ukraine. It was the latest onslaught as part of Moscow’s new, stepped-up campaign that has largely targeted Ukrainian infrastructure and disrupted supplies of power, water and heat in the country as winter looms. (AP Photo/Andrew Kravchenko)

Civilians take shelter in a metro station during an airstrike alert in the centre of Kyiv on December 5, 2022, amid the Russian invasion of Ukraine. (Photo by Dimitar DILKOFF / AFP)

Civilians take shelter in a metro station during an airstrike alert in the centre of Kyiv on December 5, 2022, amid the Russian invasion of Ukraine. (Photo by Dimitar DILKOFF / AFP)

Civilians take shelter in a metro station during an airstrike alert in the centre of Kyiv on December 5, 2022, amid the Russian invasion of Ukraine. (Photo by Dimitar DILKOFF / AFP)

A local resident takes shelter in a metro station during an airstrike alert in the centre of Kyiv on December 5, 2022, amid the Russian invasion of Ukraine. (Photo by Dimitar DILKOFF / AFP)

Civilians take shelter in an underground passage during an airstrike alert in the centre of Kyiv on December 5, 2022, amid the Russian invasion of Ukraine. (Photo by Dimitar DILKOFF / AFP)

Customers visit a store during a power cut in downtown Odessa, on December 5, 2022, amid the Russian invasion of Ukraine. - Ukraine was targeted on December 5, 2022 after nearly half of the country's energy grid has been destroyed by recent Russian missile strikes and Kyiv warning of a fresh wave of attacks. (Photo by OLEKSANDR GIMANOV / AFP)

Passengers ride in a city bus down a street during a power cut in downtown Odessa, on December 5, 2022, amid the Russian invasion of Ukraine. - Ukraine was targeted on December 5, 2022 after nearly half of the country's energy grid has been destroyed by recent Russian missile strikes and Kyiv warning of a fresh wave of attacks. (Photo by OLEKSANDR GIMANOV / AFP)

Residents prepare food on a street in the town of Irpin, northwest of Kyiv, amid the Russian invasion of Ukraine on December 4, 2022. (Photo by Dimitar DILKOFF / AFP)

Cars ride along a main street during a blackout after Russian recent rocket attacks in Kyiv, Ukraine, Friday, Dec. 2, 2022. (AP Photo/Efrem Lukatsky)

FILE - This photo shows a city center during a blackout after a Russian rocket attack in Kyiv, Ukraine, on Nov. 23, 2022. When Russian forces two months ago launched a military campaign against infrastructure in Ukraine, it opened an urgent second front far from the contact line: along power lines, water mains, and heating systems, and in places like homes, schools, offices and churches. (AP Photo/Andrew Kravchenko, File)