In July 2018 three teenage sisters stabbed and battered their father to death in his sleep, in their Moscow flat.
Investigators have confirmed the girls' father abused them physically and psychologically for years.
Charged with murder, the sisters and what should happen to them have become one of the hottest topics of debate in Russia and more than 300,000 people have signed a petition calling for their release.
What happened to the father?
On the evening of 27 July 2018 Mikhail Khachaturyan, 57, summoned Krestina, Angelina and Maria, who was a minor at the time, one by one to his room. He scolded them for not cleaning the flat properly and sprayed pepper gas in their faces.
Soon afterwards, when he had fallen asleep, the girls attacked him with a knife, hammer and pepper spray, inflicting fatal wounds to his head, neck and chest. He was found to have more than 30 knife wounds.
The young women then called the police and were arrested at the scene.
The investigation soon uncovered an extensive history of violence in the family. Khachaturyan had regularly beaten his daughters over three years, torturing them, keeping them as prisoners and sexually abusing them.
That evidence against their father is cited in their indictments.