People fleeing the Russian invasion of Ukraine queue to board a shuttle bus after crossing the border from Ukraine to Poland at the border checkpoint in Medyka, Poland.

Ukrainian refugees prepare to board a train to Berlin at the main train station, after fleeing the Russian invasion of Ukraine in Krakow, Poland

Refugees sit inside a train to Berlin at the main train station, after fleeing the Russian invasion of Ukraine in Krakow, Poland,

Lidija Ivanovna, 75, receives medical assistance after being injured when fleeing Russia's invasion of Ukraine, at the border checkpoint in Medyka, Poland,

People warm up at a bonfire while waiting to board a train to Krakow after crossing the border from Ukraine to Poland, following the Russian invasion of Ukraine, at the border checkpoint in Medyka,

Irina from Mykolaiv shows a picture of a friend's burning apartment on her mobile phone, while waiting to board a train to Krakow after crossing the border from Ukraine to Poland, following the Russian invasion of Ukraine, at the border checkpoint in Medyka, Poland