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Even though I'm not Russian, I definitely agree with the sentiment "in Russian." Saying "on Russian" is just as awkward as saying "I'm from Moscow."
p.s. "Vitya is no longer the same sponsor as before" – that's brilliant (although, for grammatical correctness, "как" should be replaced with "что," but never mind). In my opinion, it's even better than the classic "give me three thousand."