So, let's pretend for a moment that banning foul language isn't completely ridiculous, but a worthy goal from Russian government. There's still a practical problem... how?
First of all, the censorsh... (oops, "child protection") department will need to monitor consistently all sites in the Russosphere, and maybe some in the Anglosphere. Some of those won't reside in Russian Federation, and RF's gov asking the responsible countries' govs for info about the criminal swearing scum will at least result in a "lolshto" (lol, what?) from the other govs.
Second, does Mizulina really think this is feasible? How? Censors? Well, good luck, they would need all Russian tech-savvy population for that... (exactly the ones they want to control).
Filters? Hell, it's hard to make those for Latin-based languages, but almost impossible for Cyrillic-based ones! Let's say you ban a swear word in Russian (I would use examples, but /. filters all Cyrillic letters). They would need to filter the word itself, anny misspell (intentional or not), different transliterations to Latin, Volapük encoding (a leetspeak-like transliteration using Latin letters that resemble Cyrillic ones), plus, any tactics the internet use regardless of language to avoid filters (like writing pr0n, FML, phuck...).
To show the infeasibility of that, I used a three-letters swearing, khuj ("dick") as example. Just on top of my mind, I got twelve variations - you can bet any Russian native can bring a dozen more. (Here: http://pastebin.com/bcH2bg2S ).
Third and last: if they do manage to make a comprehensible list of swear words with all the variations, just imagine the amount of false positives on an international scale - like Russian gov annoying Brazilian one because someone wrote "curva" in a fucking blog! (just "curve" in Portuguese, but an acceptable transliteration for kurva ["whore"] in Russian).
Frankly... I'm not worried with this censorship being implemented at all, but rather, the intentions behind it.