Inhabitants in the Ukrainian city of Melitopol have emerged to challenge the supposed snatching of the chairman by Russian powers.
Ukrainian authorities have posted video saying it shows Ivan Fedorov being driven away blindfolded on Friday.
In a message, President Volodymyr Zelensky blamed the Russians for "moving to another phase of dread".
Melitopol, a little city in south-eastern Ukraine, was one of the first to tumble to the Russians.
In her first open appearance, Melitopol's recently introduced city chairman Galina Danilchenko asked occupants not to partake in "fanatic activities" and pronounced her fundamental assignment was development of "essential components under the new reality".
Many individuals participated in a dissent outside the city lobby on Saturday to request the arrival of past officeholder Ivan Fedorov, who had declined to co-work with Russian soldiers since they took the city on the third day of the intrusion.
Mr Fedorov was last seen on Friday evening being dragged away from the city's crisis centre by several armed men with a bag over his head.
Ukrainian officials shared a video of the incident and said the armed men were Russian soldiers.
"We are not co-working with the Russians in any capacity," Mr Fedorov had told the BBC before in the week. "They have made an effort not to help us, they can't help us, and we don't need their assistance."
Russian specialists have not remarked on his vanishing, however the investigator's office of the Russian-supported breakaway eastern Ukrainian district of Luhansk has supposedly blamed him for "psychological oppressor exercises".
Ukrainian President Volodymyr Zelensky has requested Mr Fedorov's quick delivery and requested the pioneers from Israel, Germany and France to come down on Russia to free him.
In his most recent video address on Saturday night, Mr Zelensky said Russia was to make "pseudo-republics" in Ukraine.
He adulated those declining to team up in the Russian-controlled Kherson district.
The gathering there had before taken on a goal reaffirming that it "has been, is and will be a basic piece of the assembled territory of Ukraine" because of what it said was a Russian intend to organize a mandate on the making of a "group's republic".
Mr Zelensky likewise cautioned "certain figures" of critical individual results of any cooperation - a clear reference to Ms Danilchenko.
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