(Fellow readers: this is not kneejerk Russia-bashing but a reference to the recorded fact that Sarkozy has received at least hundreds of thousands of euro from Russian government-linked entities, apparently in exchange for favours.)
That doesn't mean their intelligence services aren't also stoking various fires, some calling for more inquiries. Discord is to their benefit.
A politician who is no longer able to exert influence going to prison isn't a big loss to them, in fact it's arguably a good outcome. They get to have had favors while Sarkozy was in office and an angry France now that's he's out.