Initial examinations by Ukrainian forensic experts determined that the body was female. A DNA analysis conducted by the Office of the Prosecutor General of Ukraine confirmed a 99% match with Viktoria Roshchyna.
The body showed signs of a postmortem dissection carried out in Russia and presented clear evidence of torture, including abrasions, bruises, a broken rib, and suspected injuries from electric shocks.
If they go to these measures, why return the body at all?
My guess is intimidation.