A woman stands with small placards reading 'Stop genocide in Ukraine' and 'There was no Putin in Bucha' during the charity concert 'Together for Ukraine' in Prague on April 3, 2022. - More than half a million people have returned to Ukraine since the start of Russia's invasion in February, the Ukrainian interior ministry said on April 3, 2022. Tens of thousands have been leaving Ukraine daily since the start of the war in what has become Europe's worst refugee crisis since World War II. In total, more than 10 million people have either left their homes, either to neighbouring countries or being displaced within Ukraine. (Photo by Michal Cizek / AFP)