Russian attacks in the east of Ukraine are destroying civilian infrastructure, with military experts saying outdated weaponry is putting the lives of residents at risk.
Street-to-street fighting and missile attacks in the region of Luhansk have damaged residential areas.
Russia's defense ministry said it had targeted Ukrainian artillery units with a series of airstrikes on Saturday.
But the governor of Luhansk said the attacks had also destroyed train stations, factories, and schools.
British defense officials say Russia's use of older, inaccurate missiles is leading to an increase in civilian casualties. They say some of Moscow's artillery was likely developed over 50 years ago.
Ukraine's President Volodymyr Zelenskyy called on the west to provide his country with a modern arsenal to fight back.
He said on Friday Ukrainian forces were doing the best with what they had, but that they needed more weapons.
Experts say the flow of arms from the west could determine the outcome of the war.
The prolonged fighting is leading to growing concerns about a global food crisis. The US State Department says at least 20 million tons of grain are stuck in storage facilities in Ukraine.
Shipping via land to neighboring countries is an option, but a Ukrainian-based logistics company says it would be prohibitively expensive. The firm says sending grain from Romania costs about three times what it did from Ukraine before the start of the invasion.