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Ukraine on Monday said tens of thousands of people are likely to have been killed in Russia's assault on the south-eastern city of Mariupol.
And the country's rights ombudswoman accused Russian troops in the region of torture and executions.
Reuters reports it has confirmed widespread destruction in Mariupol but could not verify the crimes or the estimate of those killed in the strategic city.
Mariupol lies between Russian-annexed Crimea and eastern areas of Ukraine held by Moscow-backed separatists.
"Mariupol has been destroyed, there are tens of thousands of dead, but even despite this, the Russians are not stopping their offensive," President Volodymyr Zelenskyy said in a video address to South Korean legislators.
If confirmed, it would be by far the largest number of dead so far reported in one place in Ukraine, where cities, towns and villages have come under relentless bombardment and bodies, including those of civilians, have been seen in the streets.
The head of the Russia-backed self-proclaimed Donetsk People's Republic, Denis Pushilin, told RIA news agency on Monday that more than 5,000 people may have been killed in Mariupol.
Mr Pushilin said Ukrainian forces were responsible.
The numbers of people leaving the city had fallen because Russian forces had slowed pre-departure checks, Petro Andryushchenko, an aide to the mayor of Mariupol, said on Monday on Telegram.
About 10,000 people were waiting to be screened by Russian forces, he said. Russia does not allow military personnel to leave with civilian evacuees.
There was no immediate comment from Moscow, which has previously blamed Ukraine for blocking departures.
Quoting figures from Mariupol's city administration, Ukraine's human rights ombudswoman Lyudmyla Denisova said 33,000 residents had been deported to Russia or territories held by Moscow-backed separatists in eastern Ukraine.
Russia said on Sunday it had "evacuated" 723,000 people from Ukraine since the start of what it called its "special operation." Moscow denies attacking civilians.
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A young woman looks out the window as her train arrives from Pokrovsk, in the east of Ukraine, to Lviv in the country's centre. Getty -
A truck carries black bags containing bodies exhumed from a mass grave for investigations in Bucha, in the outskirts of Kyiv, Ukraine. AP -
A child uses an air rifle to shoot at a target with the face of Russian President Vladimir Putin in Lviv, Ukraine. Getty -
Firefighters try to contain a blaze at a factory after Russian shelling in Kharkiv, Ukraine. Reuters -
A woman reads as residents shelter from Russian shelling in a Kharkiv metro station. Reuters -
Ukrainian rescuers try to put out the fire at a private building after shelling in Kharkiv, Ukraine. EPA -
A couple of residents walk past burning shops after a Russian attack in Kharkiv, Ukraine. AP Photo -
A destroyed Russian tank on the outskirts of Buzova village in Kyiv draws crowds of curious residents. AFP -
The Russian offensive in the Kyiv region has left a huge crater on a bridge in Makariv. AFP -
Workers put an Ukrainian flag on a pole in the centre of Makariv. AFP -
A Ukrainian mother is comforted by relatives after the body of her son was discovered in a manhole in Buzova village, west of Kyiv. AFP -
An injured Ukrainian on a medical evacuation train bound for the western Ukrainian city of Lviv. AFP -
A Doctors Without Borders team at work on medical evacuation train. AFP -
A damaged building in the southern port city of Mariupol. Reuters -
Graves of the victims of the Ukraine-Russia conflict in Mariupol. Reuters -
Emergency workers sift through debris of a damaged building in Mariupol. Reuters -
The conflict has forced Mariupol residents to wait in line for drinking water. Reuters -
A Russian military vehicle in Mariupol. Reuters -
Food distribution at a church in the town of Borodyanka, north-west of Kyiv. AP -
A visitor is in shock after returning to her church, which had come under Russian attack, in the Kyiv town of Makaro. AP -
Mourners gather at the funeral of Ukrainian soldier Andriy Zagornyakon in Kamianka-Buzka. Getty Images -
A resident returns with his dog to survey his damaged building in Kharkiv. EPA -
A woman and a child are forced to sit on the corridor of a building in Kharkiv that is used as a bomb shelter. EPA -
A Ukrainian guard in the eastern town of Barvinkove, during Russia's invasion of its neighbouring country. AFP -
Ukrainian guards strengthen their position in the eastern town of Barvinkove. AFP -
Emotional farewell at the train station in the eastern Ukrainian city Kramatorsk, which has come under Russian attack. AFP -
A Ukrainian serviceman surveys the damaged cultural centre, in the town of Rubizhne, Luhansk region. AFP -
A participant at the pro-Ukrainian demonstration outside Downing Street in London. Reuters -
Colleagues bid farewell to Yuriy Dadak-Ruf and Taras Kryt, the Ukrainian soldiers killed in Russian shelling of the Luhansk region. Reuters -
A villager warms himself in the yard of his house in Bucha, on the outskirts of Kyiv. AP -
Vlad, the six-year old Ukrainian who lost his mother during their confinement in a Bucha basement amid the Russian invasion, plays with a friend inside his house. AP -
A group of women wait to receive free food in Bucha. AP -
Shakhtar Donetsk players carry the Ukrainian flag before their football match against Olympiakos in Piraeus, near Athens. AP -
Rescue workers clear the rubble of an apartment building in Borodianka. Getty Images -
A man repairs the roof of a house while standing on a ladder, in Andriivka, Ukraine. Getty Images -
Valerii, 65, rides by his destroyed apartment building in Borodianka. Getty Images -
A Ukrainian woman in Borodianka waits as rescue workers search for her daughter, her son-in-law and her granddaughter among the rubble. Getty Images -
Family photos are scattered among the debris of a destroyed apartment tower in Borodianka. Getty Images -
A distraught survivor of the attack on Borodianka. Getty Images -
Debris of an apartment building in Borodianka. Getty Images -
A writing on the gate of a destroyed building in Andriivka - 'Shells, mines?' - points to the threat faced by Ukrainians. Getty Images -
Another writing on the fence of a destroyed building, in Andriivka, reads 'People children live here'. Getty Images -
A bullet-riddled car near Ozera. Getty Images
"Witnesses report that Russian national guard troops and Kadyrovite [Chechen] units are making illegal arrests, torturing detainees and executing them for any pro-Ukrainian stance," in Mariupol, Ms Denisova said in a post on Telegram.
Ukrainian Interior Ministry adviser Anton Geraschenko said on Monday that Ukrainian "deportees" were kept in guarded sanatoriums and holiday camps.
"These people are not allowed to move around freely or to have free access to communication platforms in order to contact their relatives in Ukraine," Mr Geraschenko said.
Ukraine's Deputy Prime Minister, Iryna Vereshchuk, told Reuters that the number of checkpoints along the Russian-controlled corridor between Mariupol to the Ukrainian city of Zaporizhzhia had grown from three to 15.
Mariupol was among nine humanitarian corridors agreed to with Russia on Monday to move people from besieged eastern regions, but its corridor was for private cars only, Ms Vereshchuk said on Telegram.
It was not possible to agree on the provision of buses, she said.
Ukraine says Russian forces are massing for a new offensive on eastern areas, including Mariupol, where people have been without water, food and energy supplies for weeks.
