Russian forces tightened their grip on the eastern Ukrainian city of Sievierodonetsk today, a Ukrainian official said, cutting off the last routes for evacuating citizens in a scene that echoed last month's siege of the port of Mariupol.

Amid heavy bombardment, regional governor Sergei Gaidai said on social media that all bridges out of the city had been destroyed, making it impossible to bring in humanitarian cargoes or evacuate citizens.

"It is now fully impossible unfortunately to drive into the city, to deliver something to the city. Evacuation is impossible," Mr Gaidai said.

He said 70% of the small industrial city - now the focus of one of the bloodiest battles of the war - was under Russian control, but that the remaining Ukrainian defenders were not completely blockaded.

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Ukraine has issued increasingly urgent calls for more Western heavy weapons to help defend Sievierodonetsk, which Kyiv says could hold the key to the battle for the eastern Donbas region and the course of the war, now in its fourth month.

"The battles are so fierce that fighting for not just a street but for a single high-rise building can last for days," Mr Gaidai said earlier.

He is governor of the Luhansk region that includes Sievierodonetsk.

Russian artillery fire pummelled the Azot chemical plant, where hundred of civilians were sheltering, he said.

"About 500 civilians remain on the grounds of the Azot plant in Sievierodonetsk, 40 of them are children.

"Sometimes the military manages to evacuate someone," he said.

"About 500 civilians remain on the grounds of the Azot plant in Sievierodonetsk, 40 of them are children.

"Sometimes the military manages to evacuate someone," he said.

Maksym Katerin at his damaged house today after his mother and step father were killed during shelling in the city of Lysychansk

'Surrender or die'

Russia's RIA news agency quoted a pro-Moscow separatist spokesperson, Eduard Basurin, as saying Ukrainian troops were effectively blockaded in Sievierodonetsk and should surrender or die.

Ukraine's account of civilians trapped in an industrial plant echoed the fall of Mariupol last month, where hundreds of civilians and badly wounded Ukrainian soldiers were trapped forweeks in the Azovstal steelworks.

Russia has denied targeting civilians in what it calls a "special operation" to restore Russian security and "denazify" its neighbour.

Ukraine and its Western allies call this a baseless pretext for an invasion which has killed thousands of civilians and raised fears of wider conflict in Europe.

More than five million people have fled the assault and millions more are threatened by a global energy and food crisis due to disrupted gas, oil and grain supplies from Russia and Ukraine.

Western nations are divided over how best to end it.

A Ukrainian soldier in his bunker during shellings between Russian and Ukrainian armies in the frontline at Zaporizhzhia

Mr Gaidai said a six-year-old child was among those killed inthe latest shelling of Lysychansk.

Officials in the Russian-backed separatist-controlled Donetsk region said at least three people, including a child, were killed and 18 were wounded by Ukrainian shelling that hit a market in Donetsk city.

The Donetsk News Agency showed pictures of burning stalls at the central Maisky market and several bodies on the ground.

The news agency said 155-mm calibre NATO-standard artillery munitions hit parts of the region today.

Reuters could not independently verify either report.

Burning crops

After failing to take the capital Kyiv following the 24 February invasion, Moscow focused on expanding control in the Donbas, which comprise Luhansk and neighbouring Donetsk and where pro-Russian separatists have held territory since 2014, while also trying to capture more of Ukraine's Black Sea coast.

Along the front line in the Donbas, the fighting poses a new threat as the weather warms, with shelling and rocket fire setting fields on fire and destroying ripening crops.

Lyuba, a resident in the Ukrainian-held pocket of the Donbas near the front, watched a fire blazing along the fields but said she was not planning to leave.

"Where can I go? Who is waiting for me there?" she said. "It's scary. But it is what it is."

Ukrainian Presidential Adviser Mykhailo Podolyak listed equipment he said was needed for heavy weapons parity, including1,000 howitzers, 500 tanks and 1,000 drones.

"We are waiting for a decision," he said, adding that Western defence ministers would meet on Wednesday in Brussels.

Russia issued the latest of several recent reports saying it had destroyed US and European arms and equipment, hoping to send the message that delivering more would be futile.

The defence ministry said high-precision air-based missiles had struck near the railway station in Udachne northwest of Donetsk, hitting equipment that had been delivered to Ukrainian forces.

There was no immediate word from the Ukrainian side.

Moscow has criticised the United States and other nations for sending Ukraine weapons, threatening to strike new targets if the West supplied long-range missiles.


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Burning crops

After failing to take the capital Kyiv following the 24 February invasion, Moscow focused on expanding control in the Donbas, which comprise Luhansk and neighbouring Donetsk and where pro-Russian separatists have held territory since 2014, while also trying to capture more of Ukraine's Black Sea coast.

Along the front line in the Donbas, the fighting poses a new threat as the weather warms, with shelling and rocket fire setting fields on fire and destroying ripening crops.

Lyuba, a resident in the Ukrainian-held pocket of the Donbas near the front, watched a fire blazing along the fields but said she was not planning to leave.

"Where can I go? Who is waiting for me there?" she said. "It's scary. But it is what it is."

Ukrainian Presidential Adviser Mykhailo Podolyak listed equipment he said was needed for heavy weapons parity, including1,000 howitzers, 500 tanks and 1,000 drones.

"We are waiting for a decision," he said, adding that Western defence ministers would meet on Wednesday in Brussels.

Russia issued the latest of several recent reports saying it had destroyed US and European arms and equipment, hoping to send the message that delivering more would be futile.

The defence ministry said high-precision air-based missiles had struck near the railway station in Udachne northwest of Donetsk, hitting equipment that had been delivered to Ukrainian forces.

There was no immediate word from the Ukrainian side.

Local residents clean debris in their flat in a residential building in Bakhmut, Donetsk Oblast today

But Turkey is blocking their bids and NATO chief Jens Stoltenberg said yesterday the issue may not be resolved in time for an alliance summit later this month.

Speaking to AFP, Mikhail Kasyanov, Russia's prime minister from 2000 to 2004, said he thought President Vladimir Putin was "out of it", after seeing the Russian leader summon the country's top brass for a theatrical meeting three days before the invasion on 24 February.

"I knew a different Putin," said Mr Kasyanov, 64, who has become one of the Kremlin's most vocal critics.

He predicted the war could last for up to two years and said it is imperative that Ukraine win.

"If Ukraine falls, the Baltic states will be next," he warned.

Concerns have eased over Ukraine's largest nuclear power plant in Zaporizhzhia.

Captured months ago by Russian forces but still operated by Ukrainians, the station had ceased transmitting vital safeguards data two weeks ago.

But plant officials working with the International Atomic Energy Agency have succeeded in restoring transmission, the IAEA said.

Rafael Grossi, director general of the UN agency, said it still wanted to send inspectors to the plant "as soon as possible".