Russia-Ukraine updates: US sanctions Russian military shipbuilder, diamond miner

Russia’s attacks on Mariupol will "go down in history" as a series of "war crimes," Ukrainian President Volodymyr Zelenskyy said in a video address early on Sunday.

"The terror the occupiers did to the peaceful city will be remembered for centuries to come," Zelenskyy said, according to an official translation.

More than 9,000 people were evacuated from the besieged city on Friday, followed by an additional 4,000 people on Saturday, according to Ukrainian officials.

But Russian forces blocked aid to those still trapped in the city, Zelenksyy said.

"This is a totally deliberate tactic," Zelenskyy said in an earlier video address, posted just after midnight on Saturday morning. "They have a clear order to do absolutely everything to make the humanitarian catastrophe in Ukrainian cities an 'argument' for Ukrainians to cooperate with the occupiers."

Blocking aid amounts to a "war crime," Zelenskyy said, adding that every Russian soldier should be held "100%" accountable with a "compulsory one-way ticket to The Hague," where the International Criminal Court is located.

Russian forces attempted to push into cities in eastern Ukraine have made "limited progress" in the last week, so they’ve turned instead to “indiscriminate shelling,” the UK Ministry of Defense said on Sunday.

The shelling of urban areas has caused "widespread destruction and large numbers of civilian casualties," the Ministry said in an update.

"It is likely Russia will continue to use its heavy firepower to support assaults on urban areas as it looks to limit its own already considerable losses, at the cost of further civilian casualties," the update said.

At least 847 civilians, including 64 children, have been killed in Ukraine since Russia invaded on Feb. 24, according to the United Nations.

Another 1,399 have been injured, it said.

The casualties, recorded by the Office of the United Nations High Commissioner for Human Rights, are believed to be "considerably higher" since officials have not been able to verify information in areas where there is intense fighting, the office said.

"Most of the civilian casualties recorded were caused by the use of explosive weapons with a wide impact area, including shelling from heavy artillery and multiple-launch rocket systems, and missile and air strikes," it said.

-ABC News' Jason Volack

The Kremlin confirmed Saturday that it used hypersonic missiles for the first time since invading Ukraine.

Russia used the Kinzhal aviation missile system, with hypersonic aeroballistic missiles, on the village of Delyatyn in Ukraine on Friday, according to Igor Konashenkov, a spokesman for the Russian Defense Ministry.

"On March 18, the Kinzhal aerial missile system equipped with hypersonic aero-ballistic missiles destroyed a large underground missile and air ammunition depot of the Ukrainian Armed Forces in the settlement of Deliatyn in the Ivano-Frankivsk region," Konashenkov said at a briefing on Saturday.

The Russian military claims it is capable of hitting targets at a range of more than 2,000 kilometers.