(CN) — Russia launched another missile strike into western Ukraine on Friday, hitting a military aircraft maintenance facility, and claimed to have seized parts of the southern port city of Mariupol during another day of intense fighting.
On Friday morning, Russia shot six cruise missiles, possibly from a submarine in the Black Sea, targeting a plant where military aircraft are repaired at Lviv’s international airport. Ukraine said it shot down four of the missiles.
It was another sign from Russia that it is ready to expand the war and target Western efforts in that part of Ukraine, which is not the scene of fighting, to supply Kyiv with weapons, supplies and volunteers. Last Sunday, Russian missiles hit a NATO training center near Yavoriv, killing many foreigners seeking to join the fight.
The worst of the fighting though took place in eastern Ukraine and around the southern port city of Mariupol. There were also more reports of civilian deaths, including one man who was killed in Kyiv after Russian shelling hit an area of residential blocks. Nineteen others were wounded, including four children, Ukraine said.
On Friday, the United Nations agency for human rights said it had recorded 816 civilian deaths and 1,333 civilians who have been wounded, but says that is an undercount.
In Mariupol, rescue efforts continued on Friday to pull people from under the rubble of a theater that was allegedly struck by a Russian warplane on Wednesday.
Hundreds of people were sheltering in the theater, apparently in underground chambers and basements. The number of casualties remained unclear, though more than 130 people have been found alive and up to 1,300 people are still missing, according to city officials. Russia accuses Ukrainian forces of planting explosives in the building and detonating it.
“We pray that all of them will be alive, but at the moment there is no information about them,” said Liudmyla Denisova, the human rights commissioner for the Ukraine parliament, as reported by Ukrinform, a Ukrainian state news agency.
Mariupol has been the scene of horrific fighting with reports that the Russian attack is led by hardcore Chechen fighters against Ukrainian warriors affiliated with the Azov Regiment, a battle-hardened group that has been at the frontline of combat over the disputed Donbas region for the past eight years.
On Friday, Russian military sources showed video of troops putting up the flag of the self-proclaimed republic of Donetsk on an administration building in Mariupol. Donetsk is one of two regions in eastern Ukraine that declared themselves autonomous in 2014, a pro-Russian move that sparked Ukraine to send in forces to quell the rebellion, which turned into a war over Donbas.

There have been grim reports of Mariupol opening mass graves and of families burying their loved ones. On Monday, the city said more than 2,500 people had been killed.
Intense fighting also was taking place in eastern Ukraine around the city of Severodonetsk, one of the last areas of the Luhansk region still under Ukrainian control. Luhansk is the other self-declared autonomous region.
The war is particularly bad northwest of Donetsk and Luhansk because it involves fighters who’ve been battling for the past eight years. Over this period, the frontline has become a land of trenches, snipers, fortifications, weapons depots, destroyed villages and artillery shelling.
Before Putin launched a full-scale Russian invasion on Feb. 24, 14,000 people had been killed in the Donbas war and up to 2 million people had fled the war-torn region. Putin has justified the invasion by saying he wanted to end the war in Donbas and “liberate” the people there. Putin is also seeking to make sure Ukraine does not become a NATO member.