Photo: Protester hold Ukrainian and Polish flags and placards as Ukrainians and Polish people demonstrate at the Main Marker Square in Krakow, Poland to express their wish to close the sky over Ukraine which is under the siege of Russian army on April 14, 2022. As the Russian Federation invaded Ukraine, the conflict forced 4 million Ukrainians to flee their country, many civilians have been killed and Russia undergoes an investigation regarding its alleged war crimes. Credit: Photo by Dominika Zarzycka/NurPhoto