It has been more than four years since Russia launched its full-scale invasion of Ukraine. BBC Correspondent Nick Beake, who was in Ukraine when the war began, returns to see how the country has been transformed by years of constant conflict. Nick and his team experience the reality of life in a modern war, from surviving a night under heavy missile fire in Kyiv to going inside the secret drone factories helping Ukraine sustain its war efforts. In this video: 0:00 Missiles hit 0:50 Returning to