Russian troops who seized the Chernobyl nuclear power plant on February 24 began leaving the station and other exclusion zones on Thursday, Ukraine's state nuclear company Energoatom said.
"This morning, the invaders announced their intentions to leave the Chernobyl nuclear power plant," Energoatom said on Telegram.
Russian troops "marched in two columns towards the Ukrainian border with Belarus" and a "small number" of Russian forces remain in the station, it said.
"There is also evidence that a column of Russian soldiers who are besieging the town of Slavutych is currently being formed to move towards Belarus," it said.
Slavutych houses the workers of the Chernobyl nuclear plant.
Since the Russian invasion, there have been fears of increased radiological risks in Chernobyl.
Chernobyl's number four reactor exploded on April 26, 1986, causing the world's worst nuclear accident which killed hundreds and spread radioactive contamination west across Europe.
Here are the Highlights on the Ukraine-Russia War:
EU and Chinese leaders meet for a first summit in two years on Friday with Brussels keen for assurances from Beijing that it will neither supply Russia with arms nor help Moscow circumvent Western sanctions imposed over the invasion of Ukraine.
In uncommonly open language, EU officials close to the preparations of the summit said any help given to Russia would damage China's international reputation and jeopardise relations with its biggest trade partners -- Europe and the United States.
Russia said a humanitarian corridor would be opened Friday morning to allow civilians out of the besieged port city of Mariupol in southeastern Ukraine.
"The Russian armed forces will reopen a humanitarian corridor from Mariupol to Zaporizhzhia on April 1 from 10:00 am," or 0700 GMT, the Russian defence ministry said.
Russia threatened Thursday to turn off its gas taps to Europe, opening up a new front in its war in Ukraine amid growing scepticism over Moscow's claim it is scaling back its onslaught.
Over a month into Russia's invasion of its neighbour, Vladimir Putin's troops have devastated cities like Mariupol with shelling, killing at least 5,000 people in the port city alone.
Russian troops on Tuesday left Ukraine's Chernobyl nuclear power plant after weeks of occupation, officials in Kyiv said Thursday.
"There are no longer any outsiders on the territory of the Chernobyl nuclear power plant," Ukraine's state agency in charge of the Chernobyl exclusion zone said on Facebook.
Earlier in the day, the state nuclear company Energoatom said Russian troops began leaving the station and other exclusion zones, which they had occupied since the start of the Russian invasion on Feb 24.
The Pentagon said on Thursday it was not clear that Russia's convoy of military vehicles to Kyiv, which once stretched some 40 miles, even exists anymore after failing to accomplish its mission.
"I don't even know if it still exists at this point... They never really accomplished their mission," said Pentagon spokesperson John Kirby.
Amid the burnt-out frames of shelled buildings and bare branches of trees, only a children's playground set, now abandoned, lends colour to this neighbourhood in the Ukrainian city of Mariupol.
The United States is looking at options to expand sanctions to impose on Russia over its invasion of Ukraine and will have more to say about it in the coming days, White House spokesperson Kate Bedingfield said on Wednesday.
Russian President Vladimir Putin's advisors fear telling him the truth about his "failing" Ukraine war strategy, the head of Britain's top communications spying agency said Thursday.
Ukrainian forces are preparing for new Russian attacks in the east of the country as Moscow builds up its troops there after suffering setbacks near the capital Kyiv, President Volodymyr Zelenskiy said on Thursday.