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The 29-year-old was found guilty of assaulting a Russian government official in 2018, alongside then-Krasnodar midfielder Pavel Mamayev.
"What I did in Russia was a mistake that I paid for dearly," Kokorin told the Fiorentina website.
"On being a bad boy, I can say that I closed a chapter in Russia, and open a new one here. I can be a bad boy on the pitch, not off the pitch."
When he was released on parole in September 2019, Kokorin signed a one-year contract extension with Zenit Saint-Petersburg before a spell on loan at Sochi.
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He joined Spartak last August but struggled to nail down a regular starting spot, scoring two goals in 10 appearances.
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