When Russia invaded Ukraine a year ago, one of the biggest successes they achieved initially was in southern Ukraine. Within a few days Russian troops attacking from Crimea had seized an area of Ukrainian territory bigger than Switzerland.
Ukrainian authorities are yet to explain what went wrong in the south in those early days. To help uncover what happened, the BBC has spoken to military officers, politicians and activists.
On 22 February 2022 at 19:15, the secretary of Ukraine's security council Oleksiy Danilov received a red folder with secret documents. They warned that the president's life was under imminent threat. Immediately, Mr Danilov contacted the head of the security services, the interior minister, prime minister and President Volodymyr Zelensky himself. บาคาร่า350