At least 50 Ukrainian civilians were evacuated from the besieged Azovstal steel plant amid the ruins of Mariupol, even as Russia continued to batter the strategic port city, Ukrainian officials said.

“Today we were able to evacuate from Azovstal 50 women, children, and elderly people,” Deputy Prime Minister Iryna Vereshchuk said on May 6 on her Telegram channel.

Vereshchuk added that, in the face of Russian attacks, “the evacuation was extremely slow…tomorrow morning we will continue the evacuation operation.”

The United Nations has scrambled to broker a deal to help evacuate some of the 200 civilians who are holed up along with an estimated 2,000 Ukrainian fighters in the massive Azovstal steel plant, one of the largest in Europe.

Ukrainian officials have accused Russian forces of disrupting an agreed evacuation process by firing on vehicles attempting to transport people out of the plant.

Russia confirmed that some 50 people had been evacuated but did not comment on Ukrainian allegations of attacks on those leaving.

Throughout the day, Russian forces continued their assault on the sprawling steel factory against the Ukrainian fighters holding out there.

Ukraine’s General Staff said in its daily assessment on May 6 that Russians were using aircraft as part of the renewed assault on the plant.

“There are many wounded, but they are not surrendering,” Ukrainian President Volodymyr Zelenskiy said on May 5 in his nightly video address. “They are holding their positions.”

Mariupol itself has been largely razed to the ground by weeks of street-to-street fighting and heavy bombardment. Azovstal has turned into a last stand for the Ukrainians troops struggling to prevent a complete Russian defeat of the city.

Zelenskiy said that, if Russian forces killed civilians or troops who could otherwise be released, his government would no longer hold peace talks with Moscow.

He said there was basically nothing left of the once-flourishing port city, only “this little turf, this little structure, the Azovstal steel mill, or what remains of it.”

The fight for Azovstal also comes amid speculation that Russian President Vladimir Putin wants a battlefield triumph that he can showcase on May 9 when Russia marks Victory Day — the anniversary of the defeat of Nazi Germany.

“The renewed effort by Russia to secure Azovstal and complete the capture of Mariupol is likely linked to the upcoming 9 May Victory Day commemorations and Putin’s desire to have a symbolic success in Ukraine,” the British Defense Ministry said in its May 6 daily assessment.

“This effort has come at personnel, equipment, and munitions cost to Russia. Whilst Ukrainian resistance continues in Azovstal, Russian losses will continue to build and frustrate their operational plans in southern Donbas,” the ministry said.

Losing Mariupol would deprive Ukraine of a vital port on the Sea of Azov. It would also give Russia the ability to establish a land corridor to the Crimean Peninsula and free up troops to fight elsewhere in the Donbas.

The Ukrainians holed up in Azovstal’s labyrinthine tunnels and industrial infrastructure have been posting videos and photographs to social media, appealing to the international community.

Soldiers are “dying in agony” due to the lack of proper treatment, Captain Svyatoslav Palamar, deputy commander of the Azov Battalion, said in a video address on May 5. He pleaded for international help to evacuate the civilians and wounded fighters there.

Andriy Yermak, a top adviser to Zelenskiy, said on May 6 that nearly 500 civilians had been evacuated from the city and the Azovstal plant as part of a United Nations-led effort.

“The next stage of rescuing our people from Azovstal is under way at the moment. Information about the results will be provided later,” Yermak said in a post on Telegram on May 6. Kyiv will “do everything to save all its civilians and military.”

The fighting comes as Russia continues its offensive in the eastern Donbas, an offensive that has proceeded slowly and without major advances, as Ukrainian forces have blocked Russian movements and even regained territory.

Ukrainian forces have been increasingly equipped with heavy artillery and powerful anti-tank and antiaircraft weaponry supplied from NATO members.

Germany, which has come under pressure at home and abroad to step up its equipment supplies, said on May 6 that it would supply seven self-propelled howitzers to Ukraine after reversing its policy not to send heavy armaments to war zones.

Earlier, Berlin announced it would also be sending “Gepard” antiaircraft systems.

The Donbas offensive came after a thwarted campaign by Russian forces north of Kyiv in the early weeks of the war. The withdrawal of Russian troops from places like Bucha, near Kyiv, has led to a cascade of reports from witnesses who say Russian units committed atrocities that could amount to war crimes.

Rights watchdog Amnesty International said on May 6 there was compelling evidence that Russian troops had committed war crimes, including extrajudicial executions of civilians, when they occupied an area outside Ukraine’s capital in February and March. Civilians also suffered abuses such as “reckless shootings and torture,” the group said.

Russian troops had committed a “host of apparent war crimes” in Bucha, including “numerous unlawful killings,” most of them near the intersection of Yablunska and Vodoprovidna streets, the report found.

With reporting by RFE/RL’s Ukrainian Service and AP