FILE - Refugee children look out from a bus leaving to Romania after fleeing the war from neighbouring Ukraine, at the border crossing in Palanca, Moldova, Friday, March 11, 2022. The U.N. refugee agency says more than 5 million refugees have fled Ukraine since Russian troops invaded the country. The agency announced the milestone in Europe’s biggest refugee crisis since World War II on Wednesday, April 20, 2022. (AP Photo/Sergei Grits, File)