War in Ukraine: Talking to a Ukrainian mother and her child who fled to Poland

On Friday, the Polish border guard said two million refugees have travelled across the border from Poland to Ukraine.

Among those, are hundreds of thousands of children.

The BBC's Dan Johnson sat down with Krystyna Tynkalyuk, a mother who is struggling to find the words to explain to her three-year-old daughter Katriusa why they can't go back home to see her father.