LVIV, UKRAINE -- Ukrainian fighters in the tunnels underneath Mariupol鈥檚 pulverized steel plant held out against Russian troops Thursday in an increasingly desperate and perhaps doomed effort to deny Moscow what would be its biggest success of the war yet: the complete capture of the strategic port city.

The bloody battle came amid growing speculation that President Vladimir Putin wants to present the Russian people with a battlefield triumph 鈥� or announce an escalation of the war 鈥� in time for Victory Day on Monday. Victory Day is the biggest patriotic holiday on the Russian calendar, marking the Soviet Union鈥檚 triumph over Nazi Germany.

Some 2,000 Ukrainian fighters, by Russia's most recent estimate, were holed up at Mariupol's sprawling Azovstal steelworks, the last pocket of resistance in a city largely reduced to rubble over the past two months. A few hundred civilians were also believed trapped there.

The defenders will 鈥渟tand till the end. They only hope for a miracle," Kateryna Prokopenko said after speaking by phone to her husband, a leader of the steel plant defenders. "They won鈥檛 surrender.鈥�

She said her husband, Azov Regiment commander Denys Prokopenko, told her he would love her forever.

鈥淚 am going mad from this. It seemed like words of goodbye,鈥� she said.

Capt. Sviatoslav Palamar, deputy commander of the regiment, told Ukrainian TV that Russian troops were inside the plant for a third day and were meeting fierce resistance. 鈥淗eavy fighting is underway," he said.

The Russians managed to get inside with the help of an electrician who knew the layout, said Anton Gerashchenko, an adviser to Ukraine鈥檚 Internal Affairs Ministry.

鈥淗e showed them the underground tunnels which are leading to the factory,鈥� Gerashchenko said in a video posted late Wednesday. 鈥淵esterday, the Russians started storming these tunnels, using the information they received from the betrayer.鈥�

The Kremlin denied its troops were storming the plant.

The fall of Mariupol would deprive Ukraine of a vital port, allow Russia to establish a land corridor to the Crimean Peninsula, which it seized from Ukraine in 2014, and free up troops to fight elsewhere in the Donbas, the eastern industrial region that the Kremlin says is now its chief objective.

Palamar pleaded for the evacuation of civilians and wounded fighters from the steelworks, saying soldiers were 鈥渄ying in agony due to the lack of proper treatment.鈥�

The Kremlin has demanded the troops surrender. They have refused. Russia has also accused them of preventing the civilians from leaving.

The head of the United Nations said another attempt to evacuate civilians from Mariupol and the plant was underway. UN Secretary-General Antonio Guterres said: 鈥淲e must continue to do all we can to get people out of these hellscapes."

More than 100 civilians were rescued from the steelworks over the weekend. But many previous attempts to open safe corridors from Mariupol have fallen through, with Ukraine blaming shelling and firing by the Russians.

Meanwhile, 10 weeks into the devastating war, Ukraine鈥檚 military claimed it recaptured some areas in the south and repelled other attacks in the east, further frustrating Putin鈥檚 ambitions after his abortive attempt to seize Kyiv. Ukrainian and Russian forces are fighting village by village.

The head of Britain鈥檚 armed forces, Chief of the Defence Staff Adm. Tony Radakin, said Putin is 鈥渢rying to rush to a tactical victory鈥� before Victory Day. But he said Russian forces are struggling to gain momentum in the Donbas.

Radakin told British broadcaster Talk TV that Russia is using missiles and weapons at such a rate that it is in a 鈥渓ogistics war鈥� to keep supplied. 鈥淭his is going to be a hard slog,鈥� he said.

Fearful of new attacks surrounding Victory Day, the mayor of the western Ukrainian city of Ivano-Frankivsk urged residents to leave for the countryside over the long weekend and warned them not to gather in public places.

And the southeastern city of Zaporizhzhia, a key transit point for evacuees from Mariupol, announced a curfew from Sunday evening through Tuesday morning.

In other developments, Belarus' authoritarian president, Alexander Lukashenko, defended Russia鈥檚 invasion of Ukraine in an interview with The Associated Press but said he didn鈥檛 expect the conflict to 鈥渄rag on this way.鈥�

Lukashenko, whose country was used by the Russians as a launch pad for the invasion, said Moscow had to act because Kyiv was 鈥減rovoking" Russia.

But he also created some distance between himself and the Kremlin, repeatedly calling for an end to the conflict and referring to it as a 鈥渨ar鈥� 鈥� a term Moscow refuses to use. It insists on calling the fighting a 鈥渟pecial military operation.鈥�

Mariupol, which had a prewar population of over 400,000, has come to symbolize the misery inflicted by the war. The siege of the city has trapped perhaps 100,000 civilians with little food, water, medicine or heat.

As the battle raged there, Russian Defence Ministry spokesman Maj. Gen. Igor Konashenkov said Russian bombardment Thursday hit dozens of Ukrainian military targets, including troop concentrations in the east, an artillery battery near the eastern settlement of Zarozhne, and rocket launchers near the southern city of Mykolaiv.

Five people were killed and dozens injured in shelling of cities in the Donbas over the past 24 hours, Ukrainian officials said, with shells hitting schools, apartments and a medical facility.

Ukrainian forces said they made some gains on the border of the southern regions of Kherson and Mykolaiv and repelled 11 Russian attacks in the Donetsk and Luhansk regions that make up the Donbas.

The Washington-based Institute for the Study of War said that Ukrainian forces "have largely stalled Russian advances in eastern Ukraine,鈥� and intensified Russian airstrikes on transportation infrastructure in the western part of the country have failed to stop Western aid shipments to Ukraine.

But the war has devastated the country's medical infrastructure, Ukrainian President Volodymyr Zelenskyy said in a video link to a charity event in the U.K., with nearly 400 healthcare facilities damaged or destroyed.

鈥淭here is simply a catastrophic situation regarding access to medical services and medicines,鈥� in areas occupied by Russian forces, he said. "Even the simplest drugs are lacking.鈥�

With the challenge of mine-clearing and rebuilding after the war in mind, Zelenskyy announced the launch of a global fundraising platform called United24.

At the same time, Poland hosted an international donor conference that raised US$6.5 billion in humanitarian aid. The gathering was attended by prime ministers and ambassadors from many European countries, as well as representatives of nations farther afield and some businesses.

In addition, a Ukrainian cabinet body began to develop proposals for a comprehensive postwar reconstruction plan, while Zelenskyy also urged Western allies to put forward a program similar to the post-World War II Marshall Plan plan to help Ukraine rebuild.

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Anna reported from Zaporizhzhia, Ukraine. Associated Press journalists Yesica Fisch in Zaporizhzhia, Inna Varenytsia and David Keyton in Kyiv, Yuras Karmanau in Lviv, Mstyslav Chernov in Kharkiv, Lolita C. Baldor in Washington and AP staff around the world contributed to this report.

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