Local authorities in the besieged Ukrainian city of Mariupol have accused Russian forces of forcibly deporting residents to Russia.

Mariupol’s city council said in a statement it received information Sunday morning that Russian troops were forcing residents of Azovstalkaya Street and from part of the Levoberezhny area to go to Russia. The statement said Russian forces were confiscating the Ukrainian passports of those being deported and issuing them a piece of paper.

ABC News has not independently confirmed the reports of people being forced to leave by Russian troops.

The Russian state news agency TASS reported on Saturday that 13 buses carrying 350 people were moving to Russia. About 50 of those people were to be sent by railway to the Yaroslavl region and the rest to temporary processing centers in Taganrog, a city in Russia’s southeastern Rostov region near Ukraine.

Ukraine has been trying to evacuate thousands of residents from Mariupol, with tens of thousands managing to escape in the past few days -- mostly in private cars heading towards the Ukrainian-held city of Zaporizhzhia. Around 300,000 people are trapped in Mariupol, according to Ukrainian officials.

In some parts of Ukraine, Russia has opened "humanitarian corridors" to Russia. Some people in some cities have chosen to go to Russia to escape the fighting, though the vast majority are seeking to move to safety in other parts of Ukraine.

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.

All Russian troops have left the Ukrainian cities of Kyiv and Chernihiv, withdrawing north toward the borders of Belarus and Russia to consolidate before likely redeploying to the Donbas region in eastern Ukraine, a senior U.S. defense official told reporters Wednesday.

But even with the Russians gone, the territory remains treacherous.

"There are some indications that they left behind mines and things like that, so the Ukrainians are being somewhat careful in some areas north of Kyiv as they begin to clear the ground and clear the territory and re-occupy it," the official said.

While the U.S. hasn't yet seen these troops redeploy elsewhere in Ukraine, it'll likely happen soon, according to the official. Ukrainian forces are preparing for a major fight in Donbas, the official said.

The official also said the Pentagon is "monitoring" an apparent nitric acid explosion in Ukraine's Luhansk region, which Russia blamed on Ukraine.

"We've seen the Russians claim that this was a Ukrainian attack on this. We do not believe that is true," the official said. "We do believe that the Russians are responsible, but exactly what they used when they did it, why they did it, what the damage is, we just don't have that level of detail," the official said.

The official also noted that a small number of Ukrainians currently in the U.S. for "professional military education" were pulled aside for a couple days of training on Switchblade drones, which the U.S. is sending overseas as part of its military aid, according to the official.

"Although it's not a very difficult system to operate, we took advantage of having them in the country to give them some rudimentary training on that," the official said.

-ABC News' Matt Seyler