By Hugo Bachega
BBC News, Zaporizhzhia
Andriy watched anxiously as Russian soldiers connected his mobile to their computer, trying to restore some files. Andriy, a 28-year-old marketing officer, was attempting to leave Mariupol. He had deleted everything he thought a Russian soldier could use against him, such as text messages discussing Russia's invasion of Ukraine or photos of the devastation in his city caused by weeks of relentless shelling.
But the internet in Mariupol, a once bustling port in southern Ukraine, had been cut off as part of the siege imposed by Russia, and Andriy had not been able to take down some of his social media posts. He remembered the first days of the war, when he had shared some anti-Russian messages and speeches from the Ukrainian president, Volodymyr Zelensky.
"I'm screwed," he thought.
The soldiers, Andriy said, already had their focus on him. On that day in early May, when he first joined the queues for filtration in Bezimenne, a small village to the east of Mariupol, one of the soldiers noticed his beard. Filtration is how the process of scrutinising civilians wishing to leave Russian-occupied areas is known. The soldier, Andriy said, instantly assumed the beard was a sign that he was a fighter with the Azov regiment, a former militia in the city which once had links with the far right.
"Is it you and your brigade killing our guys?," Andriy was asked. He replied he had never served in the army, he started working directly after graduating, but "they didn't want to hear it".
As the soldiers went through his phone, they turned to his political views, and asked his opinion of Zelensky. Andriy, cautiously, said Zelensky was "okay", and one of the soldiers wanted to know what he meant by that. Andriy told him Zelensky was just another president, not very different from those who had come before, and that in fact, he was not very interested in politics. "Well," the soldier replied, "you should just say you aren't interested in politics."
They kept Andriy's phone and told him to wait outside. He met his grandmother, mother and aunt, who had arrived with him and had already been given a document that allowed them to leave. A few minutes later, Andriy said, he was ordered to go to a tent where members of Russia's security service, the FSB, were carrying out further checks.
Five officers were sitting behind a desk, three wearing balaclavas. They showed Andriy a video he had shared on Instagram of a speech Zelensky had given, from 1 March. With it was a caption written by Andriy: "A president we can be proud of. Go home with your warship!" One of the officers took the lead. "You told us you're neutral to politics, but you support the Nazi government," Andriy recalled being told. "He hit me in the throat. He basically started the beating."
Like Andriy, Dmytro had his phone confiscated at a checkpoint as he tried to leave Mariupol in late March. Dmytro, a 34-year-old history teacher, said the soldiers came across the word "ruscist", a play on "Russia" and "fascist", in a message to a friend. The soldiers, Dmytro told me, slapped and kicked him, and "everything [happened] because I used that word."
Dmytro said he was taken, with four other people, to a police station in the village of Nikolsky, also a filtration point. "The highest-ranking officer punched me four times in the face," he said. "It seemed to be part of the procedure".
His interrogators said teachers like him were spreading pro-Ukrainian propaganda. They also asked what he thought about "the events of 2014", the year that Russia annexed the Crimea peninsula and started supporting pro-Russian separatists in Donetsk and Luhansk. He replied that the conflict was known as the Russo-Ukrainian war. "They said Russia was not involved, and asked me whether I agreed that it was, in fact, a Ukrainian civil war."
The officers checked his phone again, and this time found a photo of a book which had the letter H in its title. "We got you!" the soldiers told Dmytro. Russia's president, Vladimir Putin, claims his war in Ukraine is an effort to "de-Nazify" the country, and the soldiers, Dmytro said, believed he was reading books about Hitler.
The next morning, Dmytro was transferred with two women to a prison in Starobesheve, a separatist-controlled village in Donetsk. He counted 24 people in the four-bunk cell. After four days and another detailed interrogation, he was finally released, and eventually reached Ukrainian-held territory. Weeks later, he still does not know what happened to his cell mates.
Back inside the tent in Bezimenne, Andriy noticed two other people with their hands tied behind them, who had been left in a corner while the officers paid attention to him. "They started to beat me way harder," Andriy told me, "everywhere". At one point, after a blow to the stomach, he felt as if he was about to faint. He managed to sit on a chair.
"I wondered what would be better," he said, "to lose consciousness and fall down or tolerate the pain further."
At least, Andriy thought, he had not been sent somewhere else, away from his family. Ukrainian officials say thousands of people are believed to have been sent to detention centres and camps set up in Russian-controlled areas during filtration. In almost all cases, their relatives do not know where they are being held, or why. "I [was] very angry about everything," Andriy said, "but, at the same time, I know it could've been much worse."
His mother tried to get into the tent, but was stopped by the officers. "She was very nervous. She later said they had told her that my 're-education' had started," Andriy said, "and that she shouldn't be worried." His ordeal, he told me, continued for two and a half hours. He was even forced to make a video saying "Glory to the Russian army!", a mockery of "Slava Ukraini!", the Ukrainian slogan.
The final question, Andriy said, was whether he had "understood his mistakes", and "I obviously answered yes". As he was being released, officers brought in another man, who had previously served in Ukraine's military and had several tattoos. "They immediately pushed him to the ground and started to beat him," Andriy said. "They didn't even talk to him."
Ukrainian authorities say Russian forces and Russian-backed separatists have carried out filtration in occupied territories as an attempt to establish residents' possible links with the military, law enforcement and even local government, as the invading forces try to restore services and infrastructure.
Men of fighting age are particularly targeted, checked for bruises that could suggest recent use of weapons, such as on the fingers and shoulders. Strip searches are common, witnesses say, including for women. Oleksandra Matviychuk, the head of the Center for Civil Liberties, a Kyiv-based human rights group, said the process, even when not violent, was "inhuman". "There's no military need for this… They're trying to occupy the country with a tool I call 'immense pain of civilian people'. You ask: 'Why so much cruelty? For what?'"
Maksym, a 48-year-old steelworker, said he was forced to strip naked while officers in Bezimenne checked even the seams of his clothes. He was asked whether he was from the Azov regiment or was a Nazi sympathiser – he denied being either – and why he wanted to leave Mariupol. "I said, 'Actually, it's you who are on Ukrainian soil.'" One of the officers, who he said were all Russian, reacted by hitting Maksym with the gun butt in his chest. He fell.
"I leaned my head on the ground, holding my ribs. I couldn't get up," he said. "It was very painful to breathe."
He was taken to what he described as a "cage", where others were being held. He noticed that one man, a weightlifter, had a tattoo of Poseidon, the Greek god, with a trident. The soldiers, Maksym said, thought it was the Ukrainian coat of arms. "He explained it to them but they didn't understand." Those detained in the "cage" were given no water or food, and had to urinate in a corner in front of everyone, Maksym told me. At one point, exhausted, he tried to sleep on the ground. An officer came in and kicked him in the back, forcing him to stand.
People would be taken to be interrogated and, when they returned, "you saw the person had been beaten," Maksym said. He witnessed a woman in her 40s lying in pain, apparently after being hit in the stomach. A man, who seemed to be around 50, had a bleeding lip and red bruises on his neck. Maksym believed he had been strangled. No-one in the "cage" asked or said anything to each other. They were afraid that FSB officers could be disguised as prisoners.
After about four or five hours, Maksym was released and allowed to leave Mariupol. Days later, he reached safety in Ukrainian-controlled territory, and went to a hospital to treat the persistent pain in his chest. The diagnosis: four broken ribs.
Yuriy Belousov, who leads the Department of War at the Ukrainian general prosecutor's office, said his team had received allegations of torture and even killings during filtration. "[It seems to be] a Russian policy which was designed in advance, and pretty well prepared," he told me. "It's definitely not just a single case or [something] done by a local military guy."
He acknowledged it was difficult to verify the cases, or estimate the scale of the violence. The Ukrainian authorities are unable to carry out investigations in occupied territories and most victims remain reluctant to share their stories, concerned that relatives in Mariupol could be targeted if their identity is exposed.
Vadym, 43, who used to work at a state-owned company in Mariupol, said he was tortured in Bezimenne in March. Separatist soldiers had questioned his wife after finding out she had "liked" the Ukrainian army page on Facebook, and restoring a receipt on her phone of a donation she had made to them. "I tried to stand up for her," he said, "but was knocked down." He got up, but was beaten once more. A pattern, he said, that happened again and again.
When Russian soldiers realised where he worked, they took Vadym to a different building. There, Vadym said, separatist soldiers asked him "stupid things" and started to beat him. "They used electricity. I almost died. I fell and choked on my dental fillings, which had come out from my teeth," Vadym said. He vomited and fainted. "They were furious. When I recovered consciousness, they told me to clean everything up and continued to give me electric shocks."
The torture, Vadym said, only stopped after Russian officers intervened. They carried out another round of questioning before finally freeing him. As Vadym left the building, he saw a young woman, who had been identified during the process as a court clerk, being carried out.
"A plastic bag was put on her head, and her hands were tied," Vadym said. "Her mother was on her knees, begging for her daughter not to be taken away."
Vadym's release came with a condition: he would have to go to Russia. About 1.2 million people in Ukraine, including thousands of Mariupol residents, have been sent to Russia against their will since the invasion began in February, according to Ukrainian officials. Russia denies it is carrying out a mass deportation, which would constitute a war crime under international humanitarian law, and says it is simply helping those who want to go. Ukraine rejects this claim.
Some of those sent to Russia have managed to escape to other countries and even return to Ukraine. How many, remains unclear. Vadym, with the help of his friends, moved to another European country – he did not want to reveal the exact location. He had lost some of his vision, he told me, and doctors said this was a result of head injuries from the beating. "I feel better now, but rehabilitation will take a long time." I asked him what he thought about filtration. "They separate families. People are being disappeared," he said. "It's pure terror."
Russia's defence ministry did not respond to several requests for comment on the allegations. The Russian government has previously denied it is carrying out war crimes in Ukraine.
Andriy and his family have now settled in Germany, after also having been forced to go to Russia. Looking back, he believes the occupying forces seemed to be using filtration to show their "absolute power". Soldiers, he said, acted as if it was a "type of entertainment", something to "satisfy their own ego".
I told him about another Ukrainian I had met, a 60-year-old retired engineer called Viktoriia. A soldier found out she had added a Ukrainian flag to her profile photo on Facebook, she told me, and the message "Ukraine above all."
She said that he pointed his gun at her and threatened: "I'll put you in the basement until you rot!" He then kicked her, she said. Viktoriia could not understand why he had acted like that. "What did I do? What right did they have?"
Andriy said he could not explain such behaviour. "I even try to justify the process somehow. Try to convince myself there's some logic."
But, he said, "there's no logic".
Some names have been changed to protect identities
Additional reporting by Illia Tolstov; photographs by Janne Kern
Follow Hugo on Twitter: @hugobachega
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'The Russians said beatings were my re-education' – BBC
By Hugo Bachega