An ongoing refugee crisis began in Europe in late February 2022 after Russia's invasion of Ukraine. Nearly 7.9 million refugees fleeing Ukraine have been recorded across Europe, while an estimated 8 million people had been displaced within the country by late May. Approximately one-quarter of the country's total population had left their homes in Ukraine by 20 March. 90% of Ukrainian refugees are women and children, while most Ukrainian men age 18 to 60 are banned from leaving the country. By 24 March, more than half of all children in Ukraine had left their homes, of whom a quarter had left the country. The invasion caused Europe's largest refugee crisis since World War II and its aftermath, is the first of its kind in Europe since the Yugoslav Wars in the 1990s, and is the largest refuge