"Street fighting is currently taking place," a representative of the separatists, Andrei Marochko, said on Telegram, in a claim that could not be independently verified.

Far from the embattled Donbas, meanwhile, a flurry of Russian missiles was striking targets in northern and western Ukraine.

"More than 50 missiles of various types were fired: air, sea and ground-based," Ukraine's air force command said Saturday, noting the difficulty of intercepting Russian models such as the Iskander.

Ukrainian president Volodymyr Zelensky, who will address G7 leaders on Monday, said cities as far away as Lviv, near the Polish border, had been struck.

"This confirms ... that Ukraine needs more assistance with weapons, and that air defence systems -- the modern systems which our partners have -- should not be on the sites or in storage, but in Ukraine," he said in his daily address.

Pull in Belarus

In Saint Petersburg on Saturday, Putin said Russia would deliver Iskander-M missiles capable of carrying nuclear warheads to Belarus in the coming months, as he received Belarusian leader Alexander Lukashenko.

He also offered to upgrade Belarus' warplanes to make them capable of carrying nuclear weapons, in comments broadcast on Russian television.

Putin has referred to nuclear weapons several times since his country invaded Ukraine on 24 February, in what the West has seen as a warning to the West not to intervene.

Ukraine said it had come under "massive bombardment" Saturday morning from neighbouring Belarus which, although a Russian ally, is not officially involved in the conflict.

Twenty rockets "fired from the territory of Belarus and from the air" targeted the village of Desna in the northern Chernigiv region, Ukraine's northern military command said.

It said infrastructure was hit, but no casualties had yet been reported.

Belarus has provided logistic support to Moscow since its 24 February invasion, particularly in the first few weeks, and like Russia has been targeted by Western sanctions.

"Today's strike is directly linked to Kremlin efforts to pull Belarus as a co-belligerent into the war in Ukraine," the Ukrainian intelligence service said.

'Ukraine can win'

Russia's weekend breakthrough in Severodonetsk came on the eve of a week of feverish Western diplomacy, as US president Joe Biden flew to Europe for a G7 summit that starts Sunday, and NATO talks later in the week.

"Ukraine can win and it will win, but they need our backing to do so," said British prime minister Boris Johnson in a statement on the eve of the summit.

"Now is not the time to give up on Ukraine."

The Western allies will take stock of the effectiveness of sanctions imposed so far against Moscow, consider possible new aid for Ukraine, and begin turning their eye to longer-term reconstruction plans.

The European Union offered a strong show of support on Thursday when it granted Ukraine candidate status, although the path to membership is long.

Evacuating the Azot plant

As in the southern port of Mariupol before it, the battle for Severodonetsk has devastated the city.

On Saturday, Mayor Striuk said civilians had begun to evacuate the Azot chemical plant, where several hundred people had been hiding from shelling.

"These people have spent almost three months of their lives in basements, shelters," he said. "That's tough emotionally and physically."

They would now need medical and psychological support, he added.

Pro-Moscow separatists said Russian forces and their allies had taken control of the Azot factory and "evacuated" more than 800 civilians sheltering there.

Since 2014, the mainly Russian-speaking Donbas has been partially under the control of pro-Moscow separatists, who set up self-declared breakaway republics in Lugansk and Donetsk.

'Finishing what they started'

While millions of Ukrainians have fled their homes and their country since the invasion, most to neighbouring Poland, some foreigners have gone the other way to fight.

Russia said Saturday its troops had killed up to 80 Polish fighters in strikes on a factory in Konstantinovka in the Donetsk region, a claim that could not be verified.

Russia has also intensified its offensive in the northern city of Kharkiv in recent days.

An AFP team on Saturday saw a 10-storey administrative building in the city centre hit by missiles overnight, causing a fire but no casualties.

It had already been bombed, prompting one soldier on the scene to note: "The Russians are finishing what they started."

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