Sony are out of the reader business, so I wouldn't recommend buying a T3.
Kobo are pretty good, and well-regarded, but I don't know if Kobo devices have a Russian dictionary. Perhaps someone else can advise (or else ask in the Kobo forum here at MR).
Have you considered a Kindle? They have by far the best dictionaries around, and come as a standard with excellent Russian dictionaries.
Both Kobo and Kindle come as standard with Cyrillic fonts, so no need to embed fonts.
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