A pro-Russian rebel guards a captured former Ukrainian Army checkpoint outside Vuhlehirsk, Donetsk region, eastern Ukraine, Thursday, February 5, 2015. The rebels have closed in around the town in a strategy they triumphantly refer to as the Debaltseve cauldron. Separatists recently burst through government lines in the rural settlement of Vuhlehirsk. (Photo by Vadim Braydov/AP Photo)

Women dressed in traditional costumes sing Christmas carols as they gather to celebrate Orthodox Christmas at a compound of the National Architecture museum in Kyiv, Ukraine on January 7, 2022. (Photo by Valentyn Ogirenko/Reuters)

A poster of Russian President Vladimir Putin is used as target practice along a trench on the frontline with Russia-backed separatists near Zolote village, in the Lugansk region, on January 21, 2022. Ukraine's Foreign Minister Dmytro Kuleba on January 22, 2022, slammed Germany for its refusal to supply weapons to Kyiv, urging Berlin to stop “undermining unity“ and “encouraging Vladimir Putin” amid fears of a Russian invasion. (Photo by Anatolii Stepanov/AFP Photo)

Natali Sevriukova reacts next to her house following a rocket attack in the city of Kyiv, Ukraine, Friday, February 25, 2022. (Photo by Emilio Morenatti/AP Photo)

Local residents dressed in costumes perform during celebrations for the Malanka holiday in the village of Krasnoilsk in the Chernivtsi region of Ukraine, January 14, 2016. The Malanka traditional holiday is more popular in the western regions of the country and is also known as the Old New Year celebrated on January 13 and 14 – St. Basil's and St. Melania's Day, according to the old Julian calendar. During the celebrations, youngsters and adults wear traditional carnival costumes and masks, and visit local houses while singing carols, playing pranks or performing short plays. (Photo by Valentyn Ogirenko/Reuters)

Rescue workers try to pull out a piece of an exploded Grad missile outside an apartment building in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, January 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (Photo by Evgeniy Maloletka/AP Photo)

A Ukrainian serviceman is seen at his position on the front line in Krasnogorivka near Donetsk, Ukraine, August 12, 2016. (Photo by Gleb Garanich/Reuters)

A girl reacts during a rehearsal for the Independence Day military parade in central Kiev, Ukraine, August 19, 2016. (Photo by Valentyn Ogirenko/Reuters)