Editor's note: Since the publication of this article, Arkady Babchenko has appeared at a press conference in Kiev, and said his "murder" was part of a sting operation.
Before ushering Babchenko into the room, Gritsak said the Ukrainian allegedly recruited by Russian agents to kill the reporter had hired an acquaintance to be the gunman.
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Merseyside Police released a statement saying its officers were aware of "comments / threats" made on social media to Karius. The former Liverpool goalkeeper Ray Clemence said Karius would have to live with his mistakes "for the rest of his life".
Harlem Desir, the media freedom representative at the Organization for Security and Co-operation in Europe, said he was "horrified" by Babchenko's death. "Best friend of Ukraine, who told the truth about Russian aggression to the world".
Flowers sit under a picture of the 41-year-old anti-Kremlin reporter Arkady Babchenko on the memorial wall of Moscow's journalists house in Moscow on May 30, 2018.
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 had been laid by mourners at the Russian embassy in Kiev.
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Well known for being a critic of the Kremlin, he also stood in unofficial elections organised by the opposition in 2012, and also denounced Russia's actions in Syria and eastern Ukraine. "We demand that the Ukrainian authorities make every effort to promptly investigate", it said on Facebook.
Babchenko had been scathingly critical of the Kremlin in recent years.
He fled Russia in 2017 after provoking a scandal in a Facebook post that expressed indifference over the deaths of a military choir and other passengers aboard a Russian plane that crashed en route to Syria.
Ukraine had released an image of a man wanted in connection with the killing.
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Babchenko had since October 2017 worked in Kiev as a television anchor of the program, "Prime: Babchenko", airing on the Crimean Tatar channel ATR, news reports said.