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.
US Under Secretary of Defense for Policy Colin Kahl on Monday said Russia had suffered between 70,000 and 80,000 casualties, either killed or wounded, since its invasion of Ukraine began on Feb. 24. Russia calls the war a "special military operation".
Germany and France joined Britain, the Nordics and Baltic states in announcing bans on Russian use of their airspace, a major escalation in a tactic by mostly Nato allies to wage economic war against Putin in retaliation for the invasion.
Huge explosions lit up the sky early on Sunday south of the capital, Kyiv, where people hunkered down in homes, underground garages and subway stations in anticipation of a full-scale assault by Russian forces.
Russian president orders the Russian defence minister and the chief of the military’s General Staff to put the nuclear deterrent forces in a "special regime of combat duty.”
President Vladimir Putin put Russia's nuclear deterrent on high alert on Sunday in the face of a barrage of Western-led reprisals for his war on Ukraine, which said it had repelled Russian ground forces' attempts to capture urban centres.
Featuring more than 200 distinguished local and international calligraphers and artists, the Biennale seeks to underscore the significance of calligraphy as a powerful medium for cultural expression.
Last month, the government in Sindh introduced a bill that would imprison parents for up to one month if they fail to get their children immunised against polio or eight other common diseases.
Sharjah Police arrested an Arab national who deceived women by promoting home massage services in return for cheap prices through a social media platform, for the purpose of blackmail and threats to obtain money.