Question: Anatoly Karatsuba and Vladimir Levenshtein, are of which nationality?
Sentence (from "Vladimir Levenshtein"): Vladimir Iosifovich Levenshtein (Russian: Влади́мир Ио́сифович Левенште́йн ; ] ; born 1935) is a Russian scientist who has done research in information theory, error-correcting codes, and combinatorial design.
Relevant evidence: Yes