Viktoriia Roshchyna was investigating Russia’s torture sites, then found herself inside one. Manisha Ganguly and Juliette Garside report

Viktoriia Roshchyna, a Ukrainian journalist known as Vika, was determined to report on Russia’s “black sites”.

“These ‘black sites’, they’re not prisons; there’s no control on behaviour there,” Juliette Garside , an editor at the Guardian, tells Michael Safi . “So it’s where we know that some of the worst war crimes, the worst human rights abuses, take place.