Bucha, a suburb of the Ukrainian capital of Kyiv, has been liberated from Russian forces, its mayor declared.

"March 31 will go down in the history of our settlement and the entire territorial community as a day of liberation from the Russian occupiers by our armed forces,” Mayor Anatolii Fedoruk said in a video posted to Facebook Friday. "Today I state that this day is joyful and it is a great victory of our armed forces in Kyiv region."

Last week, Ukraine's Defense Ministry said Russian forces battling toward Kyiv were able to partially take several northwestern suburbs, including Bucha.

-ABC News' Irene Hanatiyuk

Over 6,200 people were evacuated from regions in southeastern Ukraine Friday by buses and private cars, according to Ukrainian officials.

In the Donetsk region, 3,071 people were evacuated from the besieged port city of Mariupol, officials said.

Earlier Friday, Mariupol officials said an estimated 100,000 civilians remained trapped in the city despite repeated efforts by Ukrainian officials to evacuate them.

Additionally, over 1,700 people were evacuated from the Luhansk region, and over 1,400 from the Zaporizhzhia region, Ukrainian officials said.

-ABC News' Irene Hanatiyuk

Russian and Ukrainian negotiators continued peace talks virtually on Friday, Mykhailo Podolyak, a chief negotiator for the Ukrainians, told ABC News.

"On the table is the key document proposed by the Ukrainian delegation - the Treaty on Security Guarantees," Podolyak said. This proposed agreement provides for the possibility of exit from the war and the prevention of future conflicts.

Ukraine proposed a new system of security guarantees similar to NATO's collective defense clause which would legally require "guarantor countries" to provide arms and impose a "no-fly" zone over Ukraine, in the event of an attack.

Both sides are working on the legal wording of the basic provisions of the contract, Podolyak said.

"The discussion is extremely difficult, since the negotiating positions of the parties are strongly influenced by the daily change in the military situation on all lines of contact," Podolyak said.

-ABC News' Bruno Roeber and James Longman

An International Committee of the Red Cross team that was on its way to Mariupol to facilitate the safe passage of civilians on Friday had to return to Zaporizhzhia. The ICRC said arrangements and conditions made it impossible to proceed.

The ICRC team, which consists of three vehicles and nine personnel, said it will try again on Saturday.

The ICRC said it is critical that parties respect the agreements and provide the necessary conditions and security guarantees, and that it plans to accompany the convoy out of Mariupol to another Ukrainian city.

-ABC News' Cindy Smith

About 631 residents of the bombed-out city of Mariupol in southeast Ukraine were able to evacuate on Thursday, according to a Ukrainian official.

Ukrainian Deputy Prime Minister Iryna Vereshchuk said the residents fled the city in private vehicles after 45 buses reserved to drive them out failed to make it into the city. Vereshchuk said another 600 civilians still in Mariupol plan to try to evacuate again on Friday.

Ukrainian President Volodymyr Zelenskyy said Thursday in an address to lawmakers of Australia, the Netherlands and Belgium that more than 90% of all buildings in Mariupol have been completely destroyed by Russian strikes.

"Thousands of peaceful Mariupol residents died, people are buried just in the city, in the courtyards of high-rise buildings, or rather, what is left of the high-rise buildings," Zelenskyy said.

-ABC News' Christine Theodorou