A Ukrainian serviceman patrols along a position at the front line with Russia-backed separatists not far Avdiivka, Donetsk region on April 5, 2021. (Photo by AFP Photo/Stringer)





Ukrainian artist Oleksandr Klymenko shows his artwork and part of an ammunition box at a studio in Kyiv, Ukraine on March 26, 2021. Instead of using regular wooden panels, artists Sofia Atlantova and Oleksandr Klymenko paint icons on the covers and bottoms of ammunition boxes brought from the eastern Donbass region, the epicentre of Ukraine's conflict with Russian-backed separatists. (Photo by Gleb Garanich/Reuters)





People walk near the ferris wheel in abandoned city of Prypyat, near Chernobyl, Ukraine, 15 April 2021. Ukraine will mark the 35th anniversary of Chernobyl tragedy on 26 April 2021. The explosion of reactor 4 of the Chernobyl nuclear power plant in the early hours of 26 April 1986 is still regarded as the worst nuclear disaster ever. (Photo by Oleg Petrasyuk/EPA/EFE)





Bullet holes on a mural after the shelling by Russia-backed rebels in Avdiivka, Donetsk region, eastern Ukraine, Friday, April 16, 2021. Growing cease-fire violations and a massive Russian military buildup are causing tensions to rise in the conflict in eastern Ukraine. Ukraine and the West have become increasingly worried about the presence of more Russian troops near the border with its neighbor and urged Moscow to pull them back. More than 14,000 people have died in seven years of fighting between forces from Kyiv and separatists loyal to Moscow. (Photo by Efrem Lukatsky/AP Photo)





Ukrainian servicemen patrol along a position at the front line with Russia-backed separatists not far Avdiivka, Donetsk region on April 5, 2021. (Photo by AFP Photo/Stringer)





Volodymyr, a service member of the Ukrainian armed forces, plays with puppies at fighting positions on the line of separation from pro-Russian rebels in Donetsk region, Ukraine on April 10, 2021. The two unnamed puppies living on frontline positions will be taken home and named by soldiers departing on troops rotation. (Photo by Oleksandr Klymenko/Reuters)





Service members of the Ukrainian armed forces walk at fighting positions on the line of separation from pro-Russian rebels near Donetsk, Ukraine on April 11, 2021. (Photo by Oleksandr Klymenko/Reuters)





A service member of the Ukrainian armed forces practices boxing at fighting positions on the line of separation from pro-Russian rebels near Donetsk, Ukraine on April 10, 2021. (Photo by Oleksandr Klymenko/Reuters)





A service member of the Ukrainian armed forces fires in an attempt to shoot down an alleged unmanned aerial vehicle (UAV) at fighting positions on the line of separation from pro-Russian rebels near Donetsk, Ukraine on April 11, 2021. (Photo by Oleksandr Klymenko/Reuters)





Service members of the Ukrainian armed forces look at a cat at fighting positions on the line of separation from pro-Russian rebels near Donetsk, Ukraine on April 10, 2021. (Photo by Oleksandr Klymenko/Reuters)





A militant of the self-proclaimed Luhansk People's Republic (LNR) stands near gravestones in the so-called Heroes' Alley as he attends the funeral of a comrade, who was said to be killed by a sniper at fighting positions on the line of separation from the Ukrainian armed forces near Zolote, at a cemetery in the town of Stakhanov (Kadiivka), Ukraine on April 14, 2021. (Photo by Alexander Ermochenko/Reuters)





A Ukrainian soldier is seen at fighting positions on the line of separation from pro-Russian rebels near Luhansk, Ukraine, Friday, April 16, 2021. Growing cease-fire violations and a massive Russian military buildup are causing tensions to rise in the conflict in eastern Ukraine, where more than 14,000 people have died in seven years of fighting between forces from Kyiv and separatists loyal to Moscow. (Photo by Efrem Lukatsky/AP Photo)





Service members of the Ukrainian armed forces walk along a street in the town of Marinka in Donetsk Region, Ukraine on April 14, 2021. (Photo by Anastasia Vlasova/Reuters)





Snipers of the Ukrainian armed forces aim their rifles during training at a firing range near the town of Marinka in Donetsk region, Ukraine on April 13, 2021. (Photo by Anastasia Vlasova/Reuters)





Militants of the self-proclaimed Luhansk People's Republic (LNR) are seen at fighting positions on the line of separation from the Ukrainian armed forces in Luhansk Region, Ukraine on April 13, 2021. (Photo by Alexander Ermochenko/Reuters)





A militant of the self-proclaimed Luhansk People's Republic (LNR) points a weapon at fighting positions on the line of separation from the Ukrainian armed forces in Luhansk Region, Ukraine on April 13, 2021. (Photo by Alexander Ermochenko/Reuters)





Gulls congregate around an old lighthouse on the Dnipro river at sunset in the town of Vyshgorod close to capital Kyiv, Ukraine, Sunday, April 4, 2021. (Photo by Efrem Lukatsky/AP Photo)





A woman points to dates written on the wall in a bomb shelter in Yasinovatya (Yasynuvata) in Donetsk Region, Ukraine on March 24, 2021. The dates refer to New Year's parties that she and other local people celebrated in the bomb shelter. Due to military escalation all along the line of contact between the forces of the Donetsk People's Republic and the Ukrainian government's forces, people in the Donetsk People's Republic started checking if their bomb shelters.are ready to be used. Some people are still living in bomb shelters because the hostilities have left them homeless. The military conflict in east Ukraine broke out in 2014. (Photo by Valentin Sprinchak/TASS)





In this March 5, 2021, file photo, a Ukrainian serviceman keeps ready a machine gun in his shelter near the front-line town of Krasnohorivka, eastern Ukraine. Tensions are rising over the conflict in eastern Ukraine, with growing violations of a cease-fire and a massive Russian military buildup near its border with the region. (Photo by Evgeniy Maloletka/AP Photo/File)





A man walks near the pool in abandoned city of Prypyat, near Chernobyl, Ukraine, 15 April 2021. Ukraine will mark the 35th anniversary of Chernobyl tragedy on 26 April 2021. The explosion of reactor 4 of the Chernobyl nuclear power plant in the early hours of 26 April 1986 is still regarded as the worst nuclear disaster ever. (Photo by Oleg Petrasyuk/EPA/EFE)