View image in fullscreenPassengers wait for a train to leave to Przemyśl in Poland on 13 March 2022. At least 1 million people had fled Ukraine to neighbouring countries since the beginning of Russia’s invasion on 24 February 2022, according to the UNPhotograph: Alessio Mamo/The GuardianShareView image in fullscreenMembers of the National Guard of Ukraine take positions in central Kyiv on 25 February 2022Photograph: Gleb Garanich/ReutersShareView image in fullscreenUkrainians crowd under a destroyed bridge as they try to flee across