It’s thought that more than 11 million people, including at least two million children, have had to flee their homes in Ukraine since Russia invaded the country in February.
15-year-old Polina, her five-year-old sister, Taisiia, and their mum Svetlana, made the journey from Ukraine to the UK in search of a new life.
The BBC has been following the family’s journey and caught up with Polina as she started high school.
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