The Ukrainian refugee crisis began with the Russian invasion of Ukraine in February 2022. As of September 2025, the UNHCR has recorded 5.7 million Ukrainian refugees around the world, with 90% of this figure residing in various European countries outside of Ukraine. Older reports by the International Organization for Migration in May 2022 show approximately eight million Ukrainians as internally displaced persons. By 20 March 2022, nearly one-quarter of Ukraine's total population had been displaced due to active military hostilities with Russia. About 90% of all Ukrainian refugees are women and children; by 24 March, more than half of all children in Ukraine had left their homes, of whom a quarter had left the country as well. Men between the ages of 18 and 60 have been banned from leaving the country under Ukrainian martial law, which came into force a few hours into Russia's first military offensive into Ukraine.