Ukrainian volunteer fighters take cover behind a military armored vehicle as they look for Russian soldiers in Lukâyanivka frontline, eastern of Kyiv, Ukraine on March 28, 2022. (Photo by Narciso Contreras/Anadolu Agency via Getty Images)





A Ukrainian serviceman is backdropped by his country's flag while standing on a tank, outside Kyiv, Ukraine, Saturday, April 2, 2022. As Russian forces pull back from Ukraine's capital region, retreating troops are creating a “catastrophic” situation for civilians by leaving mines around homes, abandoned equipment and “even the bodies of those killed”, President Volodymyr Zelenskyy warned Saturday. (Photo by Vadim Ghirda/AP Photo)





Ukrainian servicemen ride on an armored transporter driving through a Russian position overran by Ukrainian forces outside Kyiv, Ukraine, Thursday, March 31, 2022. Heavy fighting raged on the outskirts of Kyiv and other zones Thursday amid indications the Kremlin is using talk of de-escalation as cover while regrouping and resupplying its forces and redeploying them for a stepped-up offensive in eastern Ukraine. (Photo by Vadim Ghirda/AP Photo)





Ukrainian soldiers carry bodies of civilians killed by the Russian forces over the destroyed bridge in Irpin close to Kyiv, Ukraine, Thursday, March 31, 2022. The more than month-old war has killed thousands and driven more than 10 million Ukrainians from their homes including almost 4 million from their country. (Photo by Efrem Lukatsky/AP Photo)





A Ukrainian service member rests on the front line near Kyiv as Russia's invasion of Ukraine continues, Ukraine on March 29, 2022. (Photo by Gleb Garanich/Reuters)





A Ukrainian service member takes a selfie in a front of a destroyed Russian T-72 tank, as Russia?s attack on Ukraine continues, in the village of Dmytrivka in Kyiv region, Ukraine on April 1, 2022. (Photo by Oleksandr Klymenko/Reuters)





Ukrainian servicemen pose for a picture near a destroyed bridge as Russia's invasion of Ukraine continues, in the town of Irpin outside Kyiv on April 1, 2022. (Photo by Gleb Garanich/Reuters)





Ukrainian army soldiers, Igor, 23, embraces his wife Dasha, 22, after conducting a military sweep to search for possible remnants of Russian troops after their withdrawal from villages on the outskirts of Kyiv, Ukraine, Friday, April 1, 2022. (Photo by Rodrigo Abd/AP Photo)





A woman looks at Ukrainian servicemen walking in the formerly Russian-occupied Kyiv suburb of Bucha, Ukraine, Saturday, April 2, 2022. As Russian forces pull back from Ukraine's capital region, retreating troops are creating a “catastrophic” situation for civilians by leaving mines around homes, abandoned equipment and “even the bodies of those killed”, President Volodymyr Zelenskyy warned Saturday. (Photo by Rodrigo Abd/AP Photo)





Territorial Defense of the Armed Forces, 21-year-olds Svitlana, right, and Myroslava, pose for a photograph, in Lviv, western Ukraine, Thursday, March 31, 2022. Both Svitlana, and Myroslava, who studied at the same university in Kyiv, decided to leave academia and serve their country by joining the TDF only one month ago. (Photo by Nariman El-Mofty/AP Photo)





Ukrainian soldiers smile as they have a rest in Irpin close to Kyiv Friday, April 1, 2022. The more than month-old war has killed thousands and driven more than 10 million Ukrainians from their homes including almost 4 million from their country. (Photo by Efrem Lukatsky/AP Photo)





A Ukrainian serviceman secures the retreat of fellow soldiers who checked bodies lying on the street for booby traps in the formerly Russian-occupied Kyiv suburb of Bucha, Ukraine, Saturday, April 2, 2022. (Photo by Rodrigo Abd/AP Photo)





Ukrainian army soldiers take part in a military sweep to search for possible remnants of Russian troops after their withdrawal from villages in the outskirts of Kyiv, Ukraine, Friday, April 1, 2022. (Photo by Rodrigo Abd/AP Photo)





Ukrainian soldiers and foreign fighters wait before advancing in the streets during an operation to clear Russian forces from Irpin, Ukraine in March 2022. (Photo by Daniel Berehulak/New York Times/eyevine/Redux)





A Ukrainian serviceman walks along a trench along the front line, north of the Ukrainian capital of Kyiv on March 31, 2022. Kyiv said on March 31, 2022, it was sending dozens of buses to evacuate civilians from the besieged city of Mariupol after a Russian ceasefire announcement, as the international Red Cross said it was ready to lead the “desperately important” operation. (Photo by Sergei Supinsky/AFP Photo)





Kyiv region territorial defense unit pose for a picture after a military sweep to search for possible remnants of Russian troops after their withdrawal from villages in the outskirts of Kyiv, Ukraine, Friday, April 1, 2022. (Photo by Rodrigo Abd/AP Photo)





Ukrainian soldiers examine a destroyed military vehicle, in Irpin, close to Kyiv, Ukraine, Friday, April 1, 2022. Talks to stop the fighting in Ukraine resumed Friday, as another attempt to rescue civilians from the shattered and encircled city of Mariupol broke down and Russia accused the Ukrainians of a cross-border helicopter attack on an oil depot. (Photo by Efrem Lukatsky/AP Photo)





A Ukranian soldier eyes a soccer ball during a pick-up game in Irpin, on the outskirts of Kyiv, Ukraine, Saturday, April 2, 2022. (Photo by Rodrigo Abd/AP Photo)





Ukrainian army soldier Dasha, 22, checks her phone after a military sweep to search for possible remnants of Russian troops after their withdrawal from villages in the outskirts of Kyiv, Ukraine, Friday, April 1, 2022. (Photo by Rodrigo Abd/AP Photo)