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

A pause in Russian attacks on the besieged city of Mariupol has allowed for around 20,000 people to evacuate after almost two weeks of continuous bombardment, Ukrainian authorities said.

About 4,000 private vehicles were able to get civilians out of the city on Tuesday, according to Kirilo Timoshenko, an official from Ukraine’s presidential office. Of those, around 570 have reached the safer city of Zaporizhzhia to the north.

This is in addition to the 160 private vehicles that evacuated residents during a lull on Monday.

Some 300,000 people had been estimated to be trapped in the city. Russian attacks impeded previous efforts to get civilians out and to allow for humanitarian supplies to be brought in.

The Mariupol City Council reported Sunday that 2,187 residents had been killed since the start of the invasion. Vereschuk said last week that the city was "beyond a humanitarian disaster," with most roads destroyed, little communication with the outside and no power, gas or heat.

The fourth round of talks between Ukrainian and Russian leaders will resume on Wednesday, Ukraine's presidential adviser Mykhailo Podolyak tweeted.

Podolyak called it a "very difficult" process with "fundamental contradictions," but added, "there is certainly room for compromise."

State Department spokesperson Ned Price on Tuesday declined to say whether the department was optimistic about the talks, but said the U.S. hasn't seen any action from the Kremlin to demonstrate "good faith."

"We have yet to find a Russian interlocutor that is either able or willing to negotiate in good faith, and certainly not in the context of de-escalation," he said.

-ABC News' Conor Finnegan and Christine Theodorou

David Beasley, executive director of the UN World Food Programme, is sounding the alarm about a global food shortage for the world’s most vulnerable populations if the war in Ukraine doesn’t end soon.

“You're talking about the breadbasket of the world where we buy 50% of our grain from Ukraine. And so with the farmers on the battlefront, when it's harvest time and planting time, it's going to wreak havoc not just inside Ukraine, but worldwide,” Beasley told ABC News.

Before the war broke out, Beasley said climate, the pandemic and supply chain issues had already increased costs by millions, reduced available food and forced the WFP to cut distribution around the world.

“In the next nine months, if we don't end this war quickly, it could be hell on Earth,” Beasley said.

-ABC News' Martha Raddatz, Sam Sweeney

Fox News cameraman Pierre Zakrzewski has been killed in Ukraine, according to Fox News.

Zakrzewski, 55, was newsgathering with correspondent Benjamin Hall on Monday in Horenka, outside of Kyiv, when their vehicle was hit by incoming fire, the network said.

Hall was injured and hospitalized in unknown condition.

"Pierre jumped in to help out with all sorts of roles in the field - photographer, engineer, editor and producer and he did it all under immense pressure and with tremendous skill," a statement from Fox News PR said. "He was a professional, he was a journalist, and he was a friend. We here at the Fox News Channel want to offer our deepest condolences to Pierre’s wife, Michelle, and his entire family."

Ukrainian producer and fixer, 24-year-old Oleksandra Kuvshynova, who was working for Fox News during the war, was also killed in the shelling, according to the United Nations Educational, Scientific and Cultural Organization.

Kuvshynova was described by her colleagues as "hard-working, funny, kind and brave."

"Her dream was to connect with people around the world and tell their stories and she fulfilled that through her journalism," Fox News CEO Suzanne Scott said in a statement on her death sent to staff Tuesday.