You just post a picture of a serial number painted on a missile, there is no context, no visual reference, it could be one of my cars painted in green with a few numbers and on top you assert that it was part of Ukraine's arsenal.
The serial number ending in 79 seems to be real - it can be found in TG La7 (Italian TV channel) video on Youtube.
But you're right about the rest of that "proof" coming from Putin's mouthpiece (RIA) so it can't be trusted.