Red Cross renewed its attempts to send a team to Mariupol on Saturday to evacuate civilians, after a team was unable to reach the city on Friday.

"Our team is on the move this morning from Zaporizhzhia to Mariupol. I'm not able to give further information at this stage," a Red Cross spokesperson said to Reuters.

An estimated 160,000 people are trapped in Mariupol.

A team on Friday had to abandon its plan to send 54 buses and many cars to Mariupol after it was unable to get security guarantees for the convoy.

Pope Francis told reporters Saturday that he is considering making a trip to the Ukrainian capital, Kyiv.

Asked by a reporter on the papal plane taking Francis from Rome to Malta if he was considering an invitation made by Ukrainian political and religious authorities, Francis answered: "Yes, it is on the table." He gave no further details.

The pope didn’t mention Russian President Vladimir Putin by name during his remarks, but said "some potentate" had unleashed the threat of nuclear war on the world in an "infantile and destructive aggression" under the guise of "anachronist claims of nationalistic interests."

"We had thought that invasions of other countries, savage street fighting and atomic threats were grim memories of a distant past," Francis added.

-ABC News' Rashid Haddou

Ukrainian President Volodymyr Zeleneksyy claimed Russian forces are leaving behind "a catastrophic situation" and that they are mining the entire territory.

"Occupiers are retreating in the north of our country, slowly but noticeably. Somewhere they are pushed away with fighting, somewhere they are leaving their positions themselves. After their withdrawal, the situation is catastrophic, and there is so much danger," Zelenskyy said.

Zelenskyy then claimed, "First of all, airstrikes might continue. Secondly, they are mining the entire territory, houses, hardware, even the bodies of those killed. There are so many tripwires and other dangers."

He warned that people returning to these territories should be careful as "it's still not possible to return to normal life as it used to be, even at the territories that we are taking back after the fighting. We need wait till our land is de-mined, wait till we are able to assure you that there won't be new shelling."

Zelenskyy claimed Ukrainians have been able to evacuate 6,266 people, including 3,071 residents of Mariupol. He also said they are discussing the evacuation of the injured and killed military personnel and civilians, with Turkey acting as an intermediary.

Zelenskyy said Russian troops are preparing for new "powerful strikes" in the east and warned that Russia is trying to conscript people in Crimea.

Zelenskyy, speaking in Russian, addressed the Russian people, asking them to, "Warn every conscript and their parents that we don't need more killed people here. Take care of your children so that they don't turn into evil. Don't let them go to the army. Do whatever you can to let them live at home, at their home."

-ABC News' Rashid Haddou

A U.S. intercontinental ballistic missile test that was initially postponed in early March to avoid "misinterpretation" by Russia was recently canceled, the Department of the Air Force said Friday.

Defense Secretary Lloyd Austin originally delayed the routine test flight of an LGM-30G Minuteman III missile after Russia put its nuclear deterrent forces on a state of heightened alert.

"The launch had been previously delayed due to an overabundance of caution to avoid misinterpretation or miscommunication during the ongoing Russian invasion of Ukraine and was cancelled for the same reason," the Air Force said in a statement. "Our next planned test flight is later this year. The Department is confident in the readiness of the strategic forces of the United States."

-ABC News' Matt Seyler

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