‘Absolute evil’: inside the Russian prison camp where dozens of Ukrainians burned to death

Anna Vorosheva was detained at a checkpoint in March while trying to deliver humanitarian aid to Mariupol. Photograph: Abdulmonam Eassa/The Observer

Screams from soldiers being tortured, overflowing cells, inhuman conditions, a regime of intimidation and murder. Inedible gruel, no communication with the outside world, and days marked off with a home-made calendar written on a box of tea.

This, according to a prisoner who was there, is what conditions are like inside Olenivka, the notorious detention centre outside Donetsk where dozens of Ukrainian soldiers burned to death in a horrific episode late last month while in Russian captivity.