More shelling was underway Monday in city of Enerhodar, which is under Russian control and where the Zaporizhzhya Nuclear Power Plant is located.

Enerhodar Mayor Dmytro Orlov urged residents to stay inside. He said Russian forces seized another government facility in Enerhodar, a lab where 30 of the employees are refusing to cooperate with the Russian-appointed administration.

Meanwhile, Russia's semi-official Interfax reported that Ukrainian forces opened fire in Enerhodar.

Ukraine's state nuclear regulator Energoatom said the plant remained occupied and controlled by Russian forces on Monday. The Ukrainian staff continues to work and make every effort to ensure nuclear and radiation safety, but Energoatom warned that periodic shelling by Russian troops with multiple rocket launchers since last week caused a serious risk to the safe operation of the plant.

In his daily address, Ukrainian President Volodymyr Zelenskyy said Russian troops must immediately withdraw from the plant. If a catastrophe occurs, Zelenskyy warned it could affect neighboring countries.

-ABC News' Christine Theodorou, Fidel Pavlenko, Natalia Shumskaia and Yulia Drozd

Brittney Griner’s defense team filed an appeal for the verdict by Khimky City Court, according to Maria Blagovolina, a partner at Rybalkin Gortsunyan Dyakin and Partners law firm.

The WNBA star was found guilty on drug charges in a Moscow-area court this month.

-ABC News' Tanya Stukalova

The first UN-chartered ship loaded with Ukrainian wheat is set to head for Africa from the near the port city Odesa, Ukrainian officials said Sunday.

The MV Brave Commander is loaded with 23,000 tons of wheat that will be shipped to Ethiopia as part of a mission to relieve a global food crisis caused by the Russian invasion of Ukraine that has halted grain exports for months, Ukrainian Infrastructure Minister Alexander Kubrakov announced at a news conference.

Kubrakov said the UN-chartered ship is scheduled to leave the Pivdenny port near Odesa on Monday.

"When three months ago, during the meeting of the President of Ukraine (Volodymyr) Zelenskyy and the U.N. Secretary-General Antonio Guterres in Kyiv the first negotiations on unlocking Ukrainian maritime ports began, we have already seen how critical it is becoming a food situation in the world." Kubrakov wrote in a Facebook post on Sunday. "This especially applies to the least socially protected countries in Africa, Asia and Latin America, for whom Ukraine has always been a key importer of agro-production."

He said Ethiopia is in desperate need of Ukrainian grain.

"This country has been suffering from record drought and armed confrontation for the second year in a row," Kubrakov said. "Ukrainian grain for them without exaggeration -- the matter of life and death."

He said he hopes the MV Brave Commander will be the first many more grain shipments under the U.N. World Food Program.

An exiled manager at the Russian-occupied Zaporizhzhia nuclear plant told ABC News that the Ukrainian staff is treated "like captives."

Oleg, who asked to be referred by a pseudonym, said he felt threatened by the Russian soldiers.

"They didn't say, 'I'm going to shoot you now,' but they always carry guns and assault rifles with them," said Oleg, who managed one of 80 units at the plant but was able to leave last month. "And when an assault rifle or a gun has a cocked trigger, I consider it as a threat."

Amid reported shelling in the vicinity of the plant, Oleg said he was primarily concerned about its spent fuel containers, "which are in a precarious position, and they are not shielded well."

-ABC News Dragana Jovanovic, Britt Clennett, Nataliya Kushnir and Sohel Uddin