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An armed serviceman of Donetsk People's Republic militia walks past a building damaged during fighting in Mariupol. Image Credit: AP

ZAPORIZHZHIA, Ukraine: Russian President Vladimir Putin on Thursday said the “liberation” of the flattened city of Mariupol after nearly two months of fighting, demanding that its trapped Ukrainian defenders be sealed up in their underground last stand.

The fate of the besieged port has become totemic as Russia battles to complete a land bridge covering territories of Ukraine already under its control, including Crimea, which would deprive Ukraine of its industrial heartland and most of its coastline.

President Joe Biden, however, said Putin was doomed to failure in Ukraine, as he announced $800 million in extra US military aid including howitzers and tactical drones.

“Our unity at home with our allies and partners, and our unity with the Ukrainian people, is sending an unmistakable message to Putin - he will never succeed in dominating and occupying all of Ukraine,” he said.

Ukraine appealed for an immediate humanitarian corridor to allow civilians and wounded fighters to be evacuated from Mariupol’s sprawling Azovstal steel plant.

“They have almost no food, water, essential medicine,” Ukraine’s foreign ministry said.

A flow of Western military aid has helped force Russia to deflect its offensive to eastern Ukraine and accentuated the devastating pressure on places like Mariupol on the shores of the Sea of Azov.

“Mariupol has been liberated,” Russian Defence Minister Sergei Shoigu told Putin during a televised meeting. “The remaining nationalist formations took refuge in the industrial zone of the Azovstal plant.”

Shoigu said around 2,000 Ukrainian soldiers remained inside the site, where the last pocket of resistance has been sheltering in a network of underground tunnels.

Civilians trapped

Thousands are believed to have died in the city, and up to 2,000 others are also sheltering in the plant without access to drinking water or food, according to Ukrainian authorities.

Three school buses filled with Mariupol evacuees including women and children arrived in Zaporizhzhia after crossing through territory held by Russian forces, AFP journalists saw.

Putin said the “liberation” of Mariupol was a “success” for Russian forces but ordered Shoigu to call off the planned storming of the industrial area, dismissing it as “impractical”.

“There is no need to climb into these catacombs and crawl underground through these industrial facilities. Block off this industrial area so that not even a fly can escape,” Putin said.

Olexiy Arestovych, an advisor to Ukraine’s President Volodymyr Zelensky, said Putin’s decision showed the Russians were “incapable of taking Azovstal”.

He said Russia had diverted forces further north to reinforce the fight for all of Lugansk and Donetsk, two regions of Ukraine controlled by pro-Moscow separatists.

“They won’t succeed,” Arestovych warned.

The West staged another show of support for Zelensky with a visit to Kyiv by the Spanish and Danish prime ministers, a day after European Council leader Charles Michel came and vowed the EU would do “everything possible” to help Ukraine win the war.

Germany, under fire for not giving more to Zelensky’s government, said it had reached an agreement with eastern European partners to indirectly supply Ukraine with a new batch of heavy weapons.

“It’s about tanks, armoured vehicles, or other options individual countries are able to give,” Defence Minister Christine Lambrecht said, explaining that Germany would then replenish those countries’ stocks.

The deliveries would happen “in the next few days”, she said, because “military experts agree that the next two weeks will be decisive in Ukraine’s fight against Russia”.

The Pentagon had said Ukraine was receiving fighter planes to bolster its air force - but it later said only aircraft parts had been delivered.

The US Treasury said it was extending a $500 million infusion of aid to help Ukraine’s government pay salaries and pensions, and provide essential services.

At a meeting of G20 finance ministers in Washington, US Treasury Secretary Janet Yellen led a walkout of Western allies as Russian officials spoke.

In London, organisers of the Wimbledon tennis tournament banned Russian and Belarusian players from the 2022 event in response to the attacks.

And a June meeting of the UN cultural agency’s World Heritage Committee scheduled to take place in the Russian city of Kazan has been postponed indefinitely, a senior UNESCO source told AFP.