Babchenko appeared at a news conference and thanked all those who had been mourning his death.
"According to information received by the Ukrainian security service, the killing of Russian journalist Arkady Babchenko was ordered by the Russian security services themselves", Grytsak said, according to the Telegraph.
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Babchenko fought with the Russian army in Chechnya in the 1990s and went on to cover conflicts in Georgia's breakaway region of South Ossetia and Ukraine before leaving Moscow after a campaign of harassment previous year. They released today a sketch of the suspected killer, an unnamed bearded man between 40 and 45 years old.
The Ukrainian president's office referred reporters on Wednesday to comments by Foreign Minister Pavlo Klimkin, who said it was too early to draw conclusions but that there was "an astounding similarity to the methods Russian Federation uses to provoke political destabilisation".
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During an interview with Israeli journalist Lisa Rozowski in 2017, Babchenko provided a humorous reason for his fierce determination to oppose the current Russian administration.
Ukrainian Prime Minister Volodymyr Groysman said in a social media posting late on Tuesday that he was convinced what he called "the Russian totalitarian machine" had not forgiven Babchenko for what Groysman called his honesty.
A critic of President Vladimir Putin, Babchenko is considered one of Russia's best war correspondents and won praise for his poignant reportages from frontlines including the conflict in eastern Ukraine.
Kiev has in recent years seen a number of deadly attacks on high-profile journalists and politicians.
Ukrainian and Russian officials immediately blamed one another over his death.
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He said investigators would be looking at "Russian spy agencies' efforts to get rid of those who are trying to tell the truth about what is going on in Russia and Ukraine".
Babchenko fled Russian Federation previous year, fearing for his life, and settled in Ukraine.
Babchenko was widely respected in Russian Federation and Ukraine's journalistic communities as an unblinking and remarkably talented chronicler of war. Some called for Babchenko to be stripped of his Russian citizenship.
"I used to be a good soldier", Babchenko wrote in 2017.
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