POKROVSK, Ukraine (AP) — Russia claimed to have captured Mariupol on Friday in what would be its biggest victory yet in its war with Ukraine, after a nearly three-month siege that reduced much of the strategic port city to a smoking ruin, with over 20,000 civilians feared dead.

There was no immediate confirmation from Ukraine.

Russian Defense Minister Sergei Shoigu reported to President Vladimir Putin the “complete liberation” of the Azovstal steelworks in Mariupol — the last stronghold of Ukrainian resistance — and the city as a whole, spokesman Igor Konashenkov said.

Russia’s state news agency RIA Novosti quoted the ministry as saying a total of 2,439 Ukrainian fighters who had been holed up at the steelworks had surrendered since Monday, including over 500 on Friday.

The steel mill had been the site of fierce fighting for weeks. The dwindling group of outgunned fighters had held out in the plant, drawing Russian airstrikes, artillery and tank fire, before their government ordered them to abandon its defense and save their lives.

The complete takeover of Mariupol gives Putin a badly needed military victory in the war he began on Feb. 24 — a conflict that was supposed to have been a lighting victory for the Kremlin but instead has seen the failure to take the capital of Kyiv, a pullback of forces to refocus on eastern Ukraine, and the sinking of the flagship of Russia’s Black Sea fleet.

Still, military analysts said the city’s capture at this point holds more symbolic importance than anything else, since Mariupol was already effectively under Moscow’s control and most of the Russian forces that were tied down by the drawn-out fighting there have already left.

In other developments Friday, the West moved to pour billions more in aid into Ukraine and fighting raged in the the Donbas, the industrial heartland in eastern Ukraine that Putin is bent on capturing.

Russian forces shelled a vital highway and kept up attacks on a key city in the Luhansk region, hitting a school among other sites, Ukrainian authorities said. Luhansk is part of the Donbas.

The Kremlin had sought control of Mariupol to complete a land corridor between Russia and the Crimean Peninsula, which it seized from Ukraine in 2014, and free up troops to join the larger battle for control of the Donbas. The city’s loss also deprives Ukraine of a vital seaport.

The city endured some of the worst suffering of the war and became a worldwide symbol of defiance. An estimated 100,000 people remained from a prewar population of 450,000, many trapped without food, water, heat or electricity. Relentless bombardment left behind rows and rows of shattered or hollowed-out buildings.

A maternity hospital was hit with a lethal Russian airstrike on March 9, producing searing images of pregnant women being evacuated from the place.

A week later, about 300 people were reported killed in a bombing of a theater where civilians were taking shelter, although the real death toll could be closer to 600. Officials had written the word “CHILDREN” in Russian on the pavement outside to try to forestall an aerial attack.

Satellite images in April showed what appeared to be mass graves just outside Mariupol, where local officials accused Russia of concealing the slaughter by burying up to 9,000 civilians. The imagery showed rows of graves stretching away from an existing cemetery.

Mariupol Mayor Vadym Boychenko accused the Russians of “hiding their military crimes” in the mass graves and labeled it “the new Babi Yar” — recalling the ravine in Kyiv where the Nazis massacred nearly 34,000 Ukrainian Jews during World War II.

Ukrainian President Volodymyr Zelenskyy said on Monday that the evacuation of his forces from the bunkers and tunnels beneath Azovstal was done to save the lives of the fighters.

“Ukraine needs Ukrainian heroes to be alive. It’s our principle,” Zelenskyy said.

The Azovstal complex covers 11 square kilometers (4 square miles) and is threaded with about 24 kilometers (15 miles) of tunnels and bunkers. Earlier in May, hundreds of civilians were evacuated from the plant during humanitarian cease-fires.

One civilian evacuee from Azovstal, who made it to the Ukrainian controlled city of Zaporizhzhia on May 3, said she went to sleep at the plant every night afraid she wouldn’t wake up.

“You can’t imagine how scary it is when you sit in the bomb shelter, in a damp and wet basement, and it is bouncing and shaking,” said Elina Tsybulchenko, 54.

As the end drew near at Azovstal, wives of fighters who held out at the steelworks spoke emotionally about what may have been their last contact with their husbands.

Olga Boiko, wife of a marine, wiped away tears as she said that her husband had written her on Thursday: “Hello. We surrender, I don’t know when I will get in touch with you and if I will at all. Love you. Kiss you. Bye.”

Natalia Zaritskaya, wife of another fighter at Azovstal, said that based on the messages she had seen over the past two days, “Now they are on the path from hell to hell. Every inch of this path is deadly.”

She said that two days ago, her husband reported that of the 32 soldiers with whom he had served, only eight survived, most of them seriously wounded.

While Russia described the troops leaving the steel plant as a mass surrender, the Ukrainians called it a mission fulfilled. They said the fighters tied down Moscow’s forces and hindered their bid to seize the east.

Mykhailo Podolyak, an adviser to Zelenskyy, described the defense of Mariupol as “the Thermopylae of the 21st century” — a reference to one of history’s most glorious defeats, in which 300 Spartans held off a much larger Persian force in 480 B.C. before finally succumbing.

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