Kilo

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I think with their Existing Rubis-class SSN's and their upcomming state-of the art Barracuda's , a Russian old Diesel sub is the last thing they'll be intersted in.
Besides the propulsion for conventional subs these days , certainly in European countries , is AIP type subs.
They are so good and undetectable that even the US NAVY had a complete Swedish Sub together with its crew on lease for 3 years to learn how to counter that treath , even up until today it seems too much of a challenge.
Barracuda
AIP-sub ,Swedish Gotland in San Diego