A prominent tech entrepreneur is accused in a lawsuit of inflicting such severe physical harm on his girlfriend that it resulted in her losing a pregnancy. This abuse allegedly occurred during a prolonged period marked by both physical and mental torment.

In legal documents filed in Florida’s Palm Beach County Circuit Court, Serguei Beloussov, also known as Serg Bell, faces accusations from his former partner, Natalia Chernysheva. She claims that throughout their six-year relationship, Bell engaged in consistent physical abuse, intimidation, and manipulative control.

Chernysheva, now 42, asserts that the abuse not only left her with lasting physical scars but also led to post-traumatic stress disorder.

The lawsuit reveals that many of the alleged incidents were documented through surveillance footage and recordings Chernysheva made, which her legal team plans to present as evidence in court.

The complaint further details how Bell allegedly exercised almost complete control over Chernysheva’s life. This included monitoring her finances, limiting her movements, and isolating her from her social circle, thereby making her financially reliant on him.

She claims that this dominion was maintained through violence, including a specific incident on the day she disclosed her pregnancy to Bell. According to the lawsuit, this assault led to a miscarriage shortly thereafter.

Bell, 54, is the Russian-born founder of several companies, including the Swiss cybersecurity firm Acronis, valued at around $4 billion. He stepped down as CEO in 2021 and is no longer associated with the company. 

When approached by the Daily Mail for comment regarding Chernysheva’s claims, a spokesperson for Bell said: ‘We plan to vigorously pursue a legal defense in this matter.’

Serguei Beloussov – known as Serg Bell – has been accused by his ex-girlfriend of waging a ‘relentless’ campaign of domestic abuse in a lawsuit filed in Florida

Natalia Chernysheva, 42, filed the lawsuit in December. She alleges the abuse left her permanently disfigured and suffering from PTSD

Chernysheva first met Bell in 2012 and they began dating in 2016. At the time, she was working as a retail director.

Bell was ‘exceptionally charming and charismatic’ at the start of the relationship. But Chernysheva claims the dynamic shifted after he encouraged her to quit her job and work for one of his companies instead, leaving her financially dependent on him, according to the lawsuit.

She alleges Bell then treated her salary like an allowance, linking her bank cards to his accounts, monitoring her spending and punishing her by confiscating her cards or threatening to cut her off if she disobeyed him.

Chernysheva accuses Bell of systematically isolating her and dismantling her independence, leaving her with no life outside their relationship.

‘Bell also demanded sexual compliance as part of his regimen of control,’ the lawsuit alleges.

In the middle of the night, Chernysheva claims Bell would force her to perform oral sex on him, refusing to let her sleep until she complied.

The alleged abuse escalated over time. Chernysheva claims Bell would initially shove, shake and jump on her while she slept, before it intensified into punching and strangulation, according to the complaint.

‘From 2016 through 2022, Bell’s uncontrollable rage was a constant feature of their relationship,’ reads the suit.

‘He regularly subjected [Chernysheva] to savage beatings and threatened her and her family with extreme violence.’

Bell, pictured with his wife, said through a spokesperson that he plans to ‘vigorously pursue a legal defense’ against his ex’s allegations

Bells’ Instagram feed is awash with images of luxury trips with his new wife and family

Chernysheva claims many of the alleged attacks took place in front of others, including Bell’s parents, business associates and employees, though no one intervened.

She also alleges Bell would break down doors when she tried to hide from him and smash her phones to prevent her from calling for help.

In June 2017, Chernysheva claims Bell dragged her naked from a bath and attempted to force her out of their apartment while screaming: ‘Go away, traitor. Get the f**k out of here.’

She says in the complaint she lost consciousness after Bell kicked her in the head during the incident and later awoke back in bed, bruised and in pain.

‘As she began to cry, Bell launched into a bizarre and manipulative story about his business partner’s wife dying overnight,’ reads the lawsuit.

‘He claimed that [Chernysheva] was supposed to die that night, but he “changed the universe” and “saved” her by “exchanging” the other woman’s life for hers – assertions that bore no relation to reality and deflected responsibility for his conduct.’

Numerous other alleged attacks followed, including a public outburst at a Paris cafe where Bell allegedly called her a ‘stupid c**t’ and ripped her purse from her shoulder, and an incident on a flight from Singapore to Paris, according to the lawsuit.

In April 2018, she claims Bell woke her in a hotel room, shoved her to the floor and strangled her before punching her in the back of the head with such force that she collapsed.

After she looked up at him, Bell allegedly taunted: ‘Do you want more?’ before she curled into a fetal position until the attack stopped, the lawsuit says.

Bell, 54, is the founder of several companies, including the Switzerland-based cybersecurity firm Acronis, valued at around $4 billion. He is picture above at the Singapore Grand Prix in 2024

Later the same month, Chernysheva alleges Bell pushed her down the stairs during an argument at their home in Massachusetts, leaving her with bruises on her head, face and legs.

A photo, redacted in public versions of the lawsuit, claims to show the injuries she sustained.

In an audio recording cited in the lawsuit, Bell is allegedly heard threatening to kill Chernysheva and harm her family.

The following month, Chernysheva claims she was subjected to a relentless, days-long verbal and physical assault at the hands of Bell, which was triggered by his father not liking a birthday gift she’d helped pick out, the lawsuit claims.

Another vile threat allegedly came in an audio recording captured in March 2020 during a fight over a cancelled work meeting.

‘Keep talking to me, b**ch. You want me to rip your lungs out? Out of your head, you f**king b**ch. Stinking freak. You f**ked everything up. You f**ked everything up because of your shit, f**k,’ Bell is alleged to say in the clip.

Later in June, Chernysheva allegedly recorded Bell making violent threats about her father.

‘Leave it to your f**king sh**ty father. That freak, f**k! I’ll find him. I’ll f**king cut his hands off. I guarantee you…‘I will kill his children. And I don’t give a f**k, understand?’ Bell is alleged to say, per the lawsuit.

Another physical attack was allegedly captured on surveillance camera during a vacation at the Renieri di Montalcino estate in Italy, in November 2020.

According to the lawsuit, the footage shows Bell adopting a martial-arts stance before ‘mercilessly beating her as she lay helpless on the floor.’

Bell is accused of pummeling Chernysheva with such force that she lost consciousness.

‘The video captures Bell’s chilling composure: he calmly ties his shoelaces before walking away without a flicker of urgency, remorse, or concern,’ the lawsuit states.

In 2022, Bell was investigated by Western intelligence agencies over suspected ties to the Kremlin, which he vehemently denied

Over the final two years of their relationship, Chernysheva claims Bell weaponized their efforts to have a child, coercing her into IVF treatment while continuing the alleged abuse.

She claims he berated her for the fertility issues they were facing, and she hoped that falling pregnant may finally ‘quell his violent rage’, so she agreed to undergo the treatment, the lawsuit says.

On April 2, 2022, she gathered Bell and close family members to share that she was pregnant. What followed, the lawsuit alleges, was hours of violence during which Bell grabbed, shoved and chased her from room to room.

She claims she pleaded with him to stop as she began experiencing severe abdominal pain. Bell allegedly refused to take her to the hospital or summon help.

In the early hours of the following morning, Chernysheva said the pain in her stomach abruptly stopped and she feared in that moment she’d lost the pregnancy.

Three days later, she miscarried in the bathroom of their apartment, the lawsuit says.

‘With the loss of her child came the death of her last hope for their relationship,’ reads the suit.

‘In that moment, she found the resolve to finally escape him.’

Chernysheva is seeking damages for what the lawsuit describes as profound physical, emotional and economic harm, and a jury trial.

Her lawsuit was filed in December 2025 and is ongoing.

Bell’s name also appeared in the recently released Department of Justice files related to Jeffrey Epstein – but he denied meeting Epstein, insisting they only spoke on the phone once

Bell is also the founder of software firm Virtuozzo and Runa Capital, a tech-focused investment company.

In 2022, he was investigated by Western intelligence agencies over suspected ties to the Kremlin, which he vehemently denied.

Posts on his social media pages indicate that Bell married Oznur Bell, 43, a Turkish-born marketing executive, in the fall of 2022, months after he and Chernysheva split up.

The couple shares one child. Serg Bell has multiple children from past relationships.

Bell’s name also appeared in the recently released Department of Justice files related to pedophile financier Jeffrey Epstein.

In a statement to the Washington Post last month, Bell said he never met or did any business with Epstein and spoke to him only once by phone at the request of Harvard University, who were weighing a donation.