After two months hiding from Russians in the darkness of a bunker, Ukrainian survivors share how they survived by rationing tinned meat, collecting rainwater and making difficult choices.

Russia's invasion has displaced more than half of Ukraine's children. The United Nations children's agency says half of the country's children, or 4.3 million of an estimated 7.5 million, have now fled their homes, including about 1.8 million refugees who have left the country.