Alena Pisarenko and her dog, Reisi, arrive via train to the main station from the besieged city of Mariupol on March 31, 2022 in Lviv, Ukraine. Her mother said they are trying to make it to Paris where a relative lives. More than four million people have fled Ukraine since the Russian invasion of that country on February 24. Millions more have been internally displaced. (Photo by Joe Raedle/Getty Images)
