Smoke rises from the Metallurgical Combine Azovstal in Mariupol during shelling, in Mariupol, in territory under the government of the Donetsk People's Republic, eastern Ukraine, Saturday, May 7, 2022. Russia-backed separatists in eastern Ukraine say that at least 40 Ukrainian prisoners of war captured during the fighting for Mariupol have been killed by Ukrainian shelling. (AP Photo/Alexei Alexandrov, File)