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

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

The International Atomic Energy Agency, the United Nations' nuclear watchdog, said on Friday that radiation around the Chernobyl nuclear power plant is normal.

"General radiation around the plant is quite normal," IAEA Director General Rafael Mariano Grossi said at a press conference.

There have been instances of relatively higher levels of localized radiation, which may have been caused by heavy vehicles moving in the area, the IAEA said.

The IAEA said it does not have any evidence that people were possibly contaminated.

Russia has not discussed its withdrawal from Chernobyl with the IAEA, the organization said.

"On the issue of radiation we are in consultation with the Ukrainian side," Grossi said.

Grossi repeatedly stressed the unpredictability of working in a war zone, saying things may not have gone strictly according to plan.

"In case there was an emergency taking place, we are setting up a mechanism whereby we can send a team to assist almost immediately," Grossi said.

-ABC News' Guy Davies