Girls hold their mobile phone as they take refuge in a metro station in Kyiv in the morning of February 24, 2022. Air raid sirens rang out in downtown Kyiv today as cities across Ukraine were hit with what Ukrainian officials said were Russian missile strikes and artillery. - Russian President Vladimir Putin announced a military operation in Ukraine on Thursday with explosions heard soon after across the country and its foreign minister warning a "full-scale invasion" was underway. (Photo by Daniel LEAL / AFP)