Russian troops handed control of the Chernobyl nuclear power plant back to the Ukrainians and began leaving the heavily contaminated site more than a month after taking it over, authorities said Thursday, as fighting raged on the outskirts of Kyiv and other fronts.

Ukraine's state power company, Energoatom, said the pullout at Chernobyl came after soldiers received “significant doses" of radiation from digging trenches in the forest in the exclusion zone around the closed plant. But there was no independent confirmation of that.

The withdrawal took place amid growing indications the Kremlin is using talk of de-escalation in Ukraine as cover while regrouping, resupplying its forces and redeploying them for a stepped-up offensive in the eastern part of the country.

Ukrainian President Volodymyr Zelenskyy said Russian withdrawals from the north and center of the country were just a military tactic and that the forces are building up for new powerful attacks in the southeast.

“We know their intentions,” Zelenskyy said in his nightly video address to the nation. “We know that they are moving away from those areas where we hit them in order to focus on other, very important ones where it may be difficult for us.” “There will be battles ahead,” he added.

Limited cease-fire

Meanwhile, a convoy of buses headed to Mariupol in another bid to evacuate people from the besieged port city after the Russian military agreed to a limited cease-fire in the area. And a new round of talks was scheduled for Friday, five weeks into the war that has left thousands dead and driven four million Ukrainians from the country.

The International Atomic Energy Agency said it had been informed by Ukraine that the Russian forces at the site of the world's worst nuclear disaster had transferred control of it in writing to the Ukrainians. Ukraine reported that three convoys of Russian forces had left toward Belarus, while the remaining troops were apparently planning to leave too, the agency said.

Energoatom gave no details on the condition of the soldiers it said were exposed to radiation and did not say how many were affected. There was no immediate comment from the Kremlin, and the IAEA said it had not been able to confirm the reports of Russian troops receiving high doses. It said it was seeking more information.

A satellite image shows an overview of Chernobyl, amid Russia’s invasion of Ukraine, Ukraine, March 10, 2022

A satellite image shows an overview of Chernobyl, amid Russia’s invasion of Ukraine, Ukraine, March 10, 2022

Russian forces seized the Chernobyl site in the opening stages of the February 24 invasion, raising fears that they would cause damage or disruption that could spread radiation. The workforce at the site oversees the safe storage of spent fuel rods and the concrete-entombed ruins of the reactor that exploded in 1986.

Edwin Lyman, a nuclear expert with the U.S.-based Union of Concerned Scientists, said it “seems unlikely" a large number of troops would develop severe radiation illness, but it was impossible to know for sure without more details.

He said contaminated material was probably buried or covered with new topsoil during the cleanup of Chernobyl, and some soldiers may have been exposed to a “hot spot” of radiation while digging. Others may have assumed they were at risk too, he said.

Scale back military operations

Early this week, the Russians said they would significantly scale back military operations in areas around Kyiv and the northern city of Chernihiv to increase trust between the two sides and help negotiations along.

But in the Kyiv suburbs, regional governor Oleksandr Palviuk said on social media Thursday that Russian forces shelled Irpin and Makariv and that there were battles around Hostomel. Pavliuk said there were Ukrainian counterattacks and some Russian withdrawals around the suburb of Brovary to the east.

Chernihiv came under attack as well. At least one person was killed and four were wounded in the Russian shelling of a humanitarian convoy of buses sent to Chernihiv to evacuate residents cut off from food, water and other supplies, said Ukrainian Human Rights Commissioner Lyudmyla Denisova.

Ukraine also reported Russian artillery barrages in and around the northeastern city of Kharkiv. NATO Secretary-General Jens Stoltenberg said intelligence indicates Russia is not scaling back its military operations in Ukraine but is instead trying to regroup, resupply its forces and reinforce its offensive in the Donbas.

“Russia has repeatedly lied about its intentions,” Stoltenberg said. At the same time, he said, pressure is being kept up on Kyiv and other cities, and “we can expect additional offensive actions bringing even more suffering.”

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