Onlookers gasped and applauded as Arkady Babchenko re-appeared on Wednesday, introduced by the head of Ukraine's security service, who said the murder had been staged in order to foil an attempt on his life by Moscow.
Less than 24 hours earlier, Ukraine said the reporter had died from three gunshots to the back in the stairwell of his apartment building in a contract-style killing in a case that provoked an outpouring of grief and a diplomatic spat.
"Thanks to this operation we were able to foil a cynical plot and document how the Russian security service was planning for this crime," security service head Vasyl Grytsak said at the press conference.
Grytsak announced authorities had arrested the alleged mastermind of the plot, saying a Ukrainian citizen named only by the initial G. had offered to pay a hitman to carry out the killing after being recruited by Russian special forces and paid $40,000.
Ukrainian President Petro Poroshenko later met Babchenko and wrote triumphantly on Facebook that "millions of people are celebrating" the journalist's new lease of life.
The planned attack was "organised from Russian territory" with the aim of "destabilising the situation in Ukraine" and "killing one whom Russia fears most of all", he said.
"Thanks to Arkady and the Ukrainian security chiefs, for not allowing this scenario to be carried out in our country."
Anton Guerachtchenko, an adviser to Ukraine's interior minister, likened the plot to a story from a crime novel, saying on Facebook that "Sherlock Holmes successfully used the method of staging his own death to efficiently solve complicated crimes".
But Moscow, later Wednesday, condemned the plot, with the foreign ministry saying "now the true motives are beginning to be revealed for this staging, which is totally obviously yet another anti-Russian provocation".
Foreign ministry spokeswoman Maria Zakharova said it was "great news" that Babchenko was alive but on Twitter she slammed the "propagandistic effect" of the set-up.
- Put wife through 'hell' -
Grytsak, during his press conference, thanked Babchenko and his family, who he said were in the loop about the secret operation.
The reporter, however, apologised to his wife for putting her through "this hell she had to live through for three days...but there was no other option".
He later defiantly promised on Twitter to "die at 96 after dancing on Putin's grave".
"God, it got so boring being dead," he wrote. "Good morning."
News of the "death" of the prominent Russian war correspondent and former soldier set off a series of recriminations between Kiev and Moscow, and pictures and flowers were laid by mourners at the Russian embassy in Kiev.
Ukrainian officials led by Prime Minister Volodymyr Groysman accused Russia of being behind the killing of the Kremlin critic, a charge that Moscow batted back.
- 'Pathetic stunt' -
Reporters Without Borders also condemned the faked death.
"It is pathetic and regrettable that the Ukrainian police have played with the truth, whatever their motive... for the stunt," Christophe Deloire, the head of the Paris-based media watchdog, told AFP.
And Russian investigative journalist Andrei Soldatov, a former colleague of Babchenko, also questioned the value of the operation.
"To me, it's crossing a line big time. Babchenko is a journalist not a policeman, for Christ sake, and part of our job is trust, whatever Trump & Putin say about fake news," he wrote on Twitter.
"I'm glad he is alive, but he undermined even further the credibility of journalists and the media," he added.
- 'Repeated death threats' -
A number of Kremlin critics have been killed in Ukraine in recent years, with one gunned down on a Kiev street in broad daylight and another whose car exploded.
Babchenko fought in Russia's two Chechen campaigns in the 1990s and early 2000s before becoming a war correspondent and author. He repeatedly said he faced death threats.
He has contributed to a number of media outlets including top opposition newspaper Novaya Gazeta and is an avid blogger, accusing Russian authorities of killing Kremlin critics and unleashing wars in Ukraine, Syria and elsewhere.
He wrote about his experience as a young soldier in the Chechen campaigns in a book published in English under the title "One Soldier's War".
Babchenko left Russia in February 2017 after receiving threats, living first in the Czech Republic, then in Israel, before moving to Kiev.
He has hosted a programme on the Crimean Tatar TV station ATR for the past year.
Babchenko made a name for himself with his poignant reportages from the frontlines, including the conflict in eastern Ukraine that has killed more than 10,000 people.
In recent years his increasingly bombastic posts pushed the boundaries of good taste and some of his colleagues and followers stopped reading him on Facebook.