Mandatory Credit: Photo by Laurel Chor/SOPA Images/Shutterstock (12858402l) Ukrainian people who have fled their homes register at a shelter at a government-run centre for IDPs. According to the United Nations, more than three million Ukrainians have become refugees and another two million have been internally displaced since Russia began its invasion of Ukraine on Feb. 24, 2022. Ukrainian IDPs at a shelter in the region of Lviv, Ukraine - 18 Mar 2022