Ukrainian President Volodymyr Zelenskyy planned to address U.N. Security Council members on Tuesday, who are angered by mounting evidence that Russian soldiers killed civilians deliberately, with many of them slain in yards, streets, and houses and their bodies left in the open.

The bodies were discovered during Russia’s departure from cities near Kyiv, prompting calls for stronger measures against the Kremlin, including a shutdown of Russian gas and oil supplies. As a result, Germany and France expelled scores of Russian diplomats, claiming they were spies. Russian President Vladimir Putin, according to US President Joe Biden, should be prosecuted for war crimes.

“This man is vicious, and what’s going on in Bucha is awful,” Biden added, referring to the area northwest of the capital where some of the atrocities took place.

According to Barbara Woodward, the United Nations ambassador for the United Kingdom, which currently holds the council leadership, the finding of remains in Bucha was likely to be “front and center” during the Security Council session.

After receiving briefings from Secretary-General Antonio Guterres, his political chief, Rosemary DiCarlo, and U.N. humanitarian head Martin Griffiths, who is attempting to mediate a cease-fire, Zelenskyy intended to address the most powerful U.N. body. Griffiths is scheduled to visit Ukraine after meeting with Russian authorities in Moscow on Monday.

Journalists in Bucha counted dozens of bodies, many of whom were dressed in civilian clothes and seemed to be unarmed, many of whom had their wrists chained or their body burnt.

Zelenskyy promised in a video speech that Ukraine will collaborate with the European Union and the International Criminal Court to identify Russian fighters implicated in any crimes after seeing Bucha districts and speaking to starving survivors lined up for bread.

“There will come a moment when every Russian will know the complete truth about who among their fellow compatriots murdered, who provided instructions, and who turned a blind eye to the crimes,” he said.

The scenes outside Kyiv were denounced by Russian Foreign Minister Sergey Lavrov as a “stage-managed anti-Russian provocation.” The photographs included “evidence of video fraud and different fakes,” according to Kremlin spokesman Dmitry Peskov.

Previous charges of crimes by Ukraine have been dismissed by Russia as fabrications.

At least 410 citizens’ dead have been discovered in areas near Kyiv that were regained from Russian forces, according to Ukrainian officials.

One of the rooms uncovered in Bucha was termed as a “torture chamber” by the Ukrainian prosecutor-office. general’s The remains of five men with their wrists bound were discovered in the basement of a children’s sanatorium where citizens were tortured and slaughtered, according to a statement.

At least 13 dead were observed by AP journalists in Bucha, including at least 13 in and near a structure that locals claimed was used as a base by Russian forces. Three more victims were discovered in a stairway, and a group of six was set on fire.

Bodies covered in black plastic, stacked on one end of a mass grave in a Bucha graveyard, were among the deceased seen by the news agency’s correspondents. Attempting to exit the city, several of the victims were shot in automobiles or murdered in explosives. The churchyard was the only location to put the deceased because the morgue was packed and the cemetery was inaccessible, according to Father Andrii Galavin.

After her husband was captured by Russian military, Tanya Nedashkivs’ka said she buried him in a yard outside their apartment building. His body was one of the several that had been piled up in a stairway.

Another Bucha resident, Volodymyr Pilhutskyi, said that Russian troops detained his neighbor Pavlo Vlasenko because his military-style trousers and the uniforms that Vlasenko claimed belonged to his security guard son seemed suspicious. Vlasenko’s corpse was eventually discovered with burn marks from a flamethrower, according to his neighbor.

At a press conference on Monday, Russia’s U.N. envoy, Vassily Nebenzia, asserted that “not a single local person has suffered from any violent action” while Bucha was under Russian authority.

During the time when Russian forces were in Bucha, however, high-resolution satellite footage from commercial vendor Maxar Technologies revealed that many of the remains had been lying in the open for weeks. The satellite photographs of the dead were initially revealed by the New York Times.

Russia has already been accused of war crimes by Western and Ukrainian authorities. The prosecutor of the International Criminal Court has already launched an inquiry. The recent revelations, however, have increased the level of censure.

The photographs from Bucha, according to German Foreign Minister Annalena Baerbock, depict the “unbelievable barbarism of the Russian government and those who follow its propaganda.”

In Bucha, French President Emmanuel Macron stated that there is “concrete proof of war crimes” that necessitates fresh sanctions.

“I support a new round of sanctions, especially on coal and gasoline.” He declared on France-Inter radio that “we need to act.”

Despite their fury, the European allies looked to be at odds about how to respond. While Poland pushed Europe to wean itself from Russian energy as soon as possible, Germany indicated it will continue to phase down coal and oil imports over the next several months.

After failing to conquer the city quickly, Russia withdrew many of its men from the area around Kyiv.

Instead, it has pushed soldiers into eastern Ukraine in an escalating attempt to retake control of the Donbas, a mostly Russian-speaking industrial area that includes the besieged southern port city of Mariupol, which has experienced some of the war’s most intense fighting and suffering.

According to a senior US defense official who spoke on the condition of anonymity to share an intelligence assessment, around two-thirds of the Russian forces in the Kyiv area have gone and are either in Belarus or on their way there, likely to collect additional supplies and reinforcements.

According to Ukrainian Deputy Prime Minister Iryna Vereshchuk, more than 1,500 citizens were able to flee Mariupol on Monday, despite the limited quantity of private automobiles accessible.

However, a Red Cross-accompanied convoy of buses, which had been stopped for days in a bid to provide supplies and evacuate civilians, was once again unable to enter the city, according to Vereshchuk.

Elsewhere, regional governor Vitaliy Kim stated in a video message on social media that Russian shelling killed 11 people in the southern city of Mykolaiv.

As Russia prepares additional offensives, Zelenskyy called for greater armament.

“We could have saved hundreds of people if we had previously had everything we needed — all these planes, tanks, artillery, anti-missile and anti-ship weaponry,” he claimed.