A Romanian firefighter carries a child as Ukrainian refugees cross the Ukrainian-Romanian border at Isaccea-Orlivka, Romania on March 25, 2022. - More than 3.6 million refugees have fled Ukraine since the Russian invasion, with more than two million of them heading to neighbouring Poland, according to the United Nations.A total of 10 million are believed to have fled their homes, according to the world body, representing over a quarter of the population in regions under government control. (Photo by Daniel MIHAILESCU / AFP)