Question: Anatoly Karatsuba and Vladimir Levenshtein, are of which nationality?
Sentence (from "Anatoly Tkachuk"): Anatoly Petrovych Tkachuk (Ukrainian: Анатолій Петрович Ткачук , born 15 February 1937) is a retired Ukrainian rower who had his best achievements in the coxed fours, partnering with Vladimir Yevseyev, Vitaly Kurdchenko, Boris Kuzmin and Anatoly Luzgin.
Relevant evidence: No