A mum made sex films featuring her four-year-old daughter and seven-year-old stepdaughter, police claim.
Carer Anastasia Vasilyeva allegedly got a request from a friend on social media, who paid her to make child pornography.
She was arrested at her home in Khimki, a suburb of Moscow, Russia.
Vasilyeva received 31,000 roubles (£316) for pornography, it is claimed.
She faces charges for “violent sexual actions” against minors, a crime which allows for a jail sentence of between eight and 15 years.
“The resident of Moscow region sold intimate videos of her own children in (social media) Odnoklassniki,” the Mash Telegram channel reported.
Earlier this month, a convicted paedophile killer admitted murdering two underage girls in Russia – whose horrified mother said they were "shredded" to death with a knife.
Twisted maniac Vitaly Molchanov was arrested over the murders of Elena and Nana Saprunova, eight and 13, the daughters of his nurse girlfriend Valentina Saprunova, 40.
The couple had been living together for only one month when he raped and killed both girls, Russian police say.
Distraught divorcee Valentina Saprunova, 40, had no idea of his previous convictions for child rape and murder, according to reports.
Footage emerged of suspect Molchanov, 41, being detained by heavily-armed special forces in Rybinsk over the double killings last weekend.
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He was asked by a state investigator: “What were you detained for?”
The detainee replied: “For murder.”
The investigator continued: "Do you admit your guilt?”
Molchanov replied: “I admit. I am sorry, I do not understand why I did it.”
A month ago, the tragic children's mum uprooted her daughters 1,600 miles from their Siberian home to move into her new boyfriend’s flat, convinced she had found true love.
She took a job at a local hospital in Rybinsk, in the Yaroslavl region, but came home from work to find both girls “literally shredded” by a knife.
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