Question: What nationality is the lady who, with Sergei Dudakov coaches Yakau Zenko ?

full_context: Document 1: Yakau Zenko: Yakau Zenko (born 21 July 2000) is a Belarusian figure skater. In the 2015–16 season, he became the Belarusian national senior bronze medalist and junior champion. He was selected to compete at the 2016 World Junior Championships in Debrecen. In Hungary, Zenko qualified for the final segment by placing 22nd in the short program. His 15th place in the free skate lifted him to 17th overall. He trains in Moscow, Russia. Formerly a student of Julia Soldatova at Moskvich, he is now coached by Eteri Tutberidze and Sergei Dudakov at Sambo 70.
Document 2: Evgenia Tarasova: Evgenia Maximovna Tarasova (Russian: Евгения Максимовна Тарасова ; born 17 December 1994) is a Russian pair skater. With partner Vladimir Morozov, she is the 2017 World bronze medalist, the 2017 European champion, the 2016–17 Grand Prix Final champion, and a three-time Russian national medalist (silver in 2015 and 2017, bronze in 2016). Earlier in their career, they became the 2014 World Junior silver medalists and the 2014 Russian national junior champions.
Document 3: Marina Khalturina: Marina Khalturina (born June 17, 1974 in Sverdlovsk, Sverdlovsk Oblast) is a figure skater who represented Kazakhstan in international competition as a pair skater and a single skater. She competed internationally as a pair skater from 1992 through 2000, first with Andrei Krukov and then with Valeriy Artyukhov. With Krukov, she placed 14th at the 1998 Winter Olympics. With Artyuchov, she competed at both the Four Continents Championships and World Figure Skating Championships. She went back to single skating in 2001. During her career, she was coached by Juri Litvinov, Sergei Korovin, and Roman Skorniakov.
Document 4: Ksenia Stolbova: Ksenia Andreyevna Stolbova (Russian: Ксе́ния Андре́евна Столбо́ва ; born 7 February 1992) is a Russian pair skater. With partner Fedor Klimov, she is the 2014 Olympic silver medalist, the 2014 Olympic champion in the team event, the 2014 World silver medalist, a three-time European medalist (2012 bronze, 2014, 2015 silver), the 2015–16 Grand Prix Final champion, the 2013 Winter Universiade champion, a two-time World Junior medalist (2010 bronze, 2011 silver), and a three-time Russian national champion (2014, 2015, 2017).
Document 5: Maria Butyrskaya: Maria Viktorovna Butyrskaya (Russian: Мария Викторовна Бутырская , born 28 June 1972) is a Russian figure skater. She is the 1999 World champion and a three-time European champion — becoming the oldest skater and the first Russian to win the World ladies' title and the oldest skater to win the European ladies' title (2002 at age 29). Butyrskaya placed fourth at the 1998 Winter Olympics and sixth at the 2002 Winter Olympics. She won the Russian national title six times.
Document 6: Sergei Dudakov: Sergei Viktorovich Dudakov (Russian: Сергей Викторович Дудаков ; born 13 January 1970) is a Russian figure skating coach and former competitor who represented the Soviet Union. He is the 1989 Golden Spin of Zagreb champion and a two-time (1989–90) Piruetten champion. He finished 7th at the 1987 World Junior Championships. He was coached by Viktor Kudriavtsev in Moscow.
Document 7: Nikolai Morozov (figure skater): Nikolai Alexandrovich Morozov (Russian: Николай Александрович Морозов ; born 17 December 1975) is a Russian figure skating coach and choreographer. He coached Shizuka Arakawa to the 2006 Olympic gold medal and Miki Ando to two World titles. He is a former competitive ice dancer who appeared with Tatiana Navka for Belarus at the 1998 Winter Olympics, placing 16th, and at the 1998 World Championships, placing 10th. Earlier in his career, he competed with Olga Pershankova for Azerbaijan and with Ekaterina Gvozdkova for Russia.
Document 8: Vladimir Yaroshenko: Vladimir Yaroshenko (Russian: Владимир Ярошенко; born November 2, 1985 in Slavyansk-na-Kubani) – Polish-Russian ballet dancer, first soloist with Yury Grigorovich’s Ballet Theatre, Krasnodar, trained in classical Russian ballet school. Polish resident since 2007, engaged with Teatr Wielki, Warsaw, where since September 2010 is a first soloist of Polish National Ballet under direction of Krzysztof Pastor.
Document 9: Ruslan Zhiganshin: Ruslan Nailevich Zhiganshin (Russian: Руслан Наильевич Жиганшин ; born 25 September 1992) is a Russian ice dancer. With partner Elena Ilinykh, he is the 2015 Russian national champion.
Document 10: Yuko Kavaguti: Yuko Kavaguti (also: Kawaguchi, Japanese: "Kawaguchi Yūko" (川口 悠子 ) , Russian: Юко Кавагути , born 20 November 1981) is a pair skater who has represented Japan and Russia in international competition. In 2006, she began competing with Alexander Smirnov for Russia. They are two-time European champions (2010, 2015), two-time World bronze medalists (2009, 2010), two-time ISU Grand Prix Final bronze medalists (11–12 and 15–16), and three-time Russian national champions (2008–2010).
Document 11: Belarus men's national ice hockey team: The Belarusian national ice hockey team is currently ranked 9th in the world by the IIHF in their 2016 World Ranking. The team is controlled by the Belarus Ice Hockey Federation. Arguably, the greatest moment in Belarusian hockey history was the victory over Sweden in the quarter-finals of the 2002 Winter Olympics, where the team ultimately finished fourth. Belarus has 4,968 players in their national pool (0.05% of the total population). At the 2005 and 2006 World Championships their coach was Glen Hanlon, who brought the best-ever result in the IIHF World Championship – 6th place in 2006. He was succeeded by Curt Fraser, who led the team in 2007 and 2008. Hanlon returned to coach the team for the 2009 World Championships in Switzerland. Andrei Stas was named the captain for the 2017 World Championships.
Document 12: Ekaterina Gordeeva: Ekaterina "Katia" Alexandrovna Gordeeva (Russian: Екатерина Александровна Гордеева ) (born May 28, 1971) is a Russian (former Soviet) figure skater. Together with her partner and husband, the late Sergei Grinkov, she was the 1988 and 1994 Olympic Champion and four-time World Champion in pair skating. After Grinkov's death, Gordeeva continued performing as a singles skater.
Document 13: Alexandr Zaichikov: Alexandr Zaichikov (Belarusian: Аляксандр Зайчыкаў ; born (1992--) 17 1992 (age (2017)-(1992)-((11)<(08)or(11)==(08)and(30)<(17)) ) in Minsk) is a Belarusian-born Kazakh weightlifter. He competed at the 2012 Summer Olympics in the –105 kg event, and in the same event at the 2016 Summer Olympics. He won a Bronze medal at the 2016 Summer Olympics.
Document 14: Eteri Tutberidze: Eteri Georgievna Tutberidze (Russian: Этери Георгиевна Тутберидзе ; born 24 February 1974) is a Russian figure skating coach. She coaches ladies' and men's singles.
Document 15: Ramil Sarkulov: Ramil Sarkulov (born June 16, 1981 in Tashkent) is an Uzbekistani former competitive ice dancer. His partnership with Olesya Pronina lasted at least five seasons, until 1999. He then competed for three seasons with Julia Klochko (1999–2002), training under Galina Churilova in Kharkiv, Ukraine. Klochko/Sarkulov won the Uzbekistani national title in the 2001–02 season and appeared at four ISU Championships – two Four Continents and two Junior Worlds. In the 2002–03 season, he competed with Olga Akimova, coached by Churilova. Sarkulov then had a brief partnership with Ashley Taylor but the two never competed together. In 2007, he teamed up with Sun-hye Yu. Coached by Genrikh Sretenski in the United States, they placed 12th at the 2008 Four Continents and 29th at the 2008 World Championships.
ground_truth: Russian