As Ukrainians return to areas once under Russian control, they are uncovering evidence of war crimes. Panorama's Paul Kenyon travels to Kyiv to investigate the elite Russian units he encountered on the first
day of the war. He hears allegations of looting and murder and speaks to witnesses who lived through the occupation.
Tracking the soldiers east he visits a frontline town from where Ukrainian forces are launching counterattacks against troops who had previously occupied the suburbs of Kyiv.