Bobrova said she learned in September, which is when she says she stopped knowingly taking it. I think September is also when the Russian doping org sent the notice to athletes. Maybe Tukt needs to check her spam filters.
While any athlete competing at a level subject to testing has primary responsibility for keeping up with the rules and following them, I also agree that the national federations and anyone coaching athletes competing at this level ought to make a point to make sure their athletes know about these rules and any recent changes. I mean, even if they know RUSADA already sent out a notice, it would surely do no harm if the athlete also got a notice from the federation and also heard about it from their coaches, particularly when it involved a product used as routinely as Vitamin C (according to Plushenko).
One of the things that saddens me in this thread is the realization that Russian press is still manipulated to feed people only the stories (or portions thereof) they want people to know and to put their own self-serving twist on them, regardless how ridiculous they sound to everyone else. Even sadder, is the number of people who seem to have swallowed this nonsense hook, line and sinker. Ah, yes, it is all a grand conspiracy by Western-controlled WADA. They fact that all these athletes continued to use a prohibited substance after it was banned and are now getting caught somehow doesn't matter and should be excused because this drug wasn't widely used in most of the rest of the world? All illegal drugs and techniques begin somewhere. If WADA thinks a product should be banned, it makes no sense to wait a few years until it is used by more countries before they ban it. And if, as some are now pretending, this product doesn't really do much good, then why were so many athletes taking it in the first place and why did they continue to take it even after it was added to the prohibited list?