The scale of displacement resulting from the Russian aggression against Ukraine is immense; of the 4 million displaced people receiving temporary protection in the European Union, 1.3 million are children. The latest Ukraine bulletin from the EU Fundamental Rights Agency (FRA) explores the fundamental rights impact of the war on these children, the practical challenges they face and possible ways forward in their best interests. It highlights particular instances where the needs of children are not being met and their rights not fully respected, protected or fulfilled.