* Russian forces advance in east, shifting momentum
* Capture of Lyman would set stage for next phase of offensive
* Sievierodonetsk under assault
Russian forces stepped up their assault on the Ukrainian city of Sievierodonetsk on Saturday after claiming to have captured the nearby rail hub of Lyman, pressing their offensive in the eastern Donbas.
Russian gains in recent days indicate a shift in momentum in the war, now in its fourth month. The invading forces appear close to seizing all of the Luhansk region of Donbas, a main Kremlin war goal, despite Ukrainian resistance.
Russia's defence ministry said on Saturday its troops and allied separatist forces were now in full control of Lyman, site of a railway junction and lying west of the Siverskyi Donets River in the Donetsk region that neighbours Luhansk.
However Hanna Malyar, Ukraine's deputy defence minister, said the battle for Lyman continued, the ZN.ua website reported.
Sievierodonetsk, some 60 km (40 miles) from Lyman on the eastern side of the river and the largest Donbas city still held by Ukraine, was now under heavy assault from the Russians.
"Sievierodonetsk is under constant enemy fire," Ukrainian police said in a social media post on Saturday.
Russian artillery was also shelling the Lysychansk-Bakhmut road, which Russia must take to close a pincer movement and encircle Ukrainian forces.
"There was significant destruction in Lysychansk," the police said.
The governor of Luhansk, which along with Donetsk makes up the Donbas, said on Friday Russian troops had already entered Sievierodonetsk. Ukrainian troops may have to retreat from the city to avoid capture, governor Serhiy Gaidai said. It was not clear if they had begun to pull out on Saturday.
The Russian forces have been making slow but steady advances in the Donbas - large parts of which were already controlled by Moscow-backed separatists before the war - after failing to capture the capital Kyiv soon after their Feb. 24 invasion of Ukraine.
Their tactics involve mass artillery bombardments and air strikes that have laid waste to towns and cities.
The Ukrainian military said on Saturday its troops had repelled eight assaults in Donetsk and Luhansk in the previous 24 hours.
"If Russia did succeed in taking over these areas, it would highly likely be seen by the Kremlin as a substantive political achievement and be portrayed to the Russian people as justifying the invasion," the British defence ministry said in its daily intelligence report.
Some 90% of buildings in Sievierodonetsk were damaged, Governor Gaidai said, with 14 high-rise buildings destroyed in the latest shelling. Several dozen medical staff were staying on in Sievierodonetsk but they faced difficulty just getting to hospitals because of the shelling, he said.
Reuters could not independently verify the information.
President Volodymyr Zelenskiy remained defiant in his nightly address to Ukrainians.
"If the occupiers think that Lyman and Sievierodonetsk will be theirs, they are wrong. Donbas will be Ukrainian," Zelenskiy said.
Analysts at the Washington-based Institute for the Study of War said that while Russian forces had begun direct assaults on built-up areas of Sievierodonetsk, they were likely to struggle to take ground in the city itself.
"Russian forces have performed poorly in operations in built-up urban terrain throughout the war," they said.
Russia says it is waging a "special military operation" to demilitarise Ukraine and rid it of nationalists threatening Russian-speakers there. Kyiv and Western countries say Russia's claims are a false pretext for war.
Thousands of people, including many civilians, have been killed and several million have fled their homes, either for safer parts of Ukraine or to other countries.
Russian destruction of whole urban areas has drawn widespread international condemnation, although Moscow denies targeting civilians. Russian President Vladimir Putin has not been deterred by a broad range of Western sanctions on Russia, nor by earlier battlefield setbacks.
Russia's eastern gains follow the withdrawal of its forces from approaches to Kyiv, and a Ukrainian counter-offensive that pushed its forces back from Ukraine's second city, Kharkiv in the northeast.
Ukraine's General Staff also said on Saturday that multiple Russian strikes had hit communities and infrastructure near Kharkiv. A solar power station in the region was badly damaged after an apparent missile strike, a Reuters photographer said.
GUNS AND GRAIN
Pushing diplomatic efforts to find a solution to a conflict that has myriad ramifications beyond Ukraine's borders, French President Emmanuel Macron and German Chancellor Olaf Scholz spoke to Putin in a joint phone call on Saturday.
They urged him to lift the Russian blockade of the port of Odesa to allow Ukrainian grain exports, France said. The Kremlin said Putin told them Moscow was willing to discuss ways to make it possible for Ukraine to resume shipments of grain from Black Sea ports.
Ukraine is a major grain exporter and the blockage of its exports threatens to result in food shortages in a number countries, including in Africa.
Meanwhile the supply of weapons to Kyiv from its allies continued. Ukrainian Defence Minister Oleksiy Reznikov said it had started receiving Harpoon anti-ship missiles from Denmark and self-propelled howitzers from the United States.
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