Russia says it is waging a "special military operation" in Ukraine to protect Russian-speaking communities.
Heavy fighting was reported in frontline towns near the eastern city of Donetsk, where Ukrainian officials said Russian troops were launching waves of attacks as they try to seize control of the industrialised Donbas region.
"The situation in the region is tense — shelling is constant throughout the front line... The enemy is also using air strikes a great deal," Donetsk regional Governor Pavlo Kyrylenko told Ukrainian television.
"The enemy is having no success. Donetsk region is holding."
The key Antonovskyi bridge over the Dnipro river in Kherson region was targeted again by Ukrainian forces.
Around Kharkiv in the northeast, Ukrainian troops captured the town of Dovhenke from Russian occupiers and were advancing towards Izium, Ukrainian Presidential adviser Oleksiy Arestovych said in a video posted on YouTube.
"The situation is very interesting. Ukraine's forces are moving very successfully. Attempts by Russia to regain lost ground were not successful. Ukraine may end up encircling them," he said.
In the southeast, the key Antonovskyi bridge over the Dnipro river in Kherson region was targeted again by Ukrainian forces trying to disrupt Russian supply lines.
Yuri Sobolevsky, deputy head of Kherson regional council ousted by Russian occupation forces, said on Telegram the bridge had been seriously damaged after "overnight actions".
Reuters was unable to verify the reports.
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