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

The Office of the United Nations High Commissioner for Human Rights in Ukraine has recorded 2,361 civilian casualties in the country, including 902 dead and 1,459 injured.

In Ukraine's Zhytomyr region, more than 100 Ukrainian troops and foreign mercenaries were killed by a missile strike, the Russian Ministry of Defense claimed on Sunday.

"A strike using high-precision air-to-surface missiles has been carried out on a special operations forces training center of the Ukrainian Armed Forces, where foreign mercenaries in Ukraine were based near the populated locality of Ovruch in the Zhytomyr region," Russian Defense Ministry spokesperson Igor Konashenkov said in a press conference.

Marina Ovsyannikova, the Russian state TV editor who protested the invasion of Ukraine on live television, continued her campaign against the war in an interview with ABC News' George Stephanopoulos on Sunday.

"The Russian people are really against the war," Ovsyannikova said. "It’s Putin’s war and not the Russian people’s war."

Ovsyannikova ran onto the set of the main Russian state news live broadcast earlier this month with an anti-war sign to protest Russia's invasion of Ukraine, standing behind a Channel One anchor as they were speaking.

The sign read, "NO WAR" and "Don't believe the propaganda. They're lying to you here," in English and Russian, respectively.

Ovsyannikova said it was a "spontaneous decision" for her to go onto the set, but "the dissatisfaction with the current situation has been accumulating for years, because the propaganda on our state channels has become more and more distorted."

"What we showed on our programs was very different than the reality," she said.

Ovsyannikova hoped her demonstration would attract attention to the propaganda and "inspire more people to speak up."

Ovsyannikova was fined 30,000 rubles (about $280) after being charged with an "administrative offense" stemming from an earlier video she recorded calling on Russians to take part in demonstrations against the war.

-ABC News' Monica and Dunn Quinn Scanlan

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.