Alex Buttner failed to cement a first-team place at Manchester United[GETTY]
Buttner confirmed the move earlier this week but his full transfer fee has only now been released.
The Russian club have paid United £4.4m up front, with a clause ensuring it will rise an extra £1.6m depending on appearances.
And the 25-year-old Dutchman is likely to get his chance to impress in Russia's Premier League, where manager Stanislav Cherchesov wants to reform a defence that conceded nine goals in five games at the end of last season.
The Dutchman joined the Old Trafford ranks for £4m from Vitesse Arnhem in August 2012.
He becomes the third defender to leave United this summer after Rio Ferdinand and Nemanja Vidic.
Transfer Zone - Friday 27 June
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