Question: Name the Russian mixed martial artist who currently fights in the lightweight division of the UFC and is a training partner of Natalia Vitalyevna Vorobieva, a Russian wrestler who competed in the 2012 Summer Olympics?

full_context: Document 1: Khabib Nurmagomedov: Khabib Abdulmanapovich Nurmagomedov (Russian: Хабиб Абдулманапович Нурмагомедов ; Avar: ХIабиб ГӀабдулманапил НурмухӀамадов ; born September 20, 1988) is an undefeated Russian mixed martial artist of Avar heritage. He is a two time Combat Sambo World Champion, a wrestler and a judo black belt who currently fights in the Lightweight division of the Ultimate Fighting Championship. He currently holds one of the longest undefeated streaks in MMA with 24 wins. As of 17 November 2016, he is ranked the #1 contender in the UFC Lightweight division and #12 in official UFC pound-for-pound rankings and numerous other publications.
Document 2: Natalia Vorobieva: Natalia Vitalyevna Vorobieva (Russian: Наталья Витальевна Воробьёва ; born 27 May 1991 in Tulun, Irkutsk oblast, Russian SFSR, Soviet Union) is a Russian wrestler, who competed at the 2012 Summer Olympics. Vorobieva reached the finals in the 72 kg category where she beat Stanka Zlateva of Bulgaria to win the gold medal. She is also the holder of a number of titles at the youth levels. In the 2015 Golden Grand Prix Ivan Yarygin final match, Vorobyeva defeated Ochirbatyn Nasanburmaa of Mongolia. Vorobyeva train with UFC and M-1 Global MMA fighters, such as Khabib Nurmagomedov, Islam Makhachev, Vyacheslav Vasilevsky, Abubakar Nurmagomedov, Mikhail Malyutin, Ali Bagov.
Document 3: Rustaman Makhauri: Rustaman Makhauri (born 1978) is a Chechen military commander and a close associate of Doku Umarov, the anti-Russian underground Chechen leader. Makhauri was appointed by Umarov as Minister of Defense; he is suspected of being responsible for a series of attacks against the forces loyal to the governments in Chechnya and neighboring Ingushetia. He was captured by police in July 2009 in Ingushetia's district of Sunzhen and charged with involvement in the June 22, 2009 attack on the Ingush president Yunus-Bek Yevkurov.
Document 4: Anastasija Grigorjeva: Anastasija Grigorjeva (born 12 May 1990) is a Latvian freestyle wrestler of Russian origin. She has qualified for 2012 Summer Olympics in London. She won European Championships 2010 (Women's freestyle – 55 kg) and won silver in 2012 (Women's freestyle – 59 kg). Grigorjeva was born in Daugavpils, Latvia.She started to train in wrestling from 2003 year. Before she was training in judo and some years later, she came to woman freestyle wrestling. From 2012 year she studies in the University of Daugavpils.
Document 5: Islam Makhachev: Islam Ramazanovich Makhachev (Russian: Ислам Рамазанович Махачев ; born October 27, 1991 in Dagestan) is a Russian mixed martial artist, judoka and sambist of Lak origin. He is a Combat Sambo World Champion, and currently fights in the lightweight division of the Ultimate Fighting Championship.
Document 6: Natascha Ragosina: Natalia Yurievna Ragozina (Russian: Наталья Юрьевна Рагозина ), better known as Natascha Ragosina, is an undefeated retired professional boxer who spent much of her career ranked as the top female super middleweight in the world. Though born in Kazakhstan (formerly a part of the Soviet Union) and currently residing in Moscow, she competed professionally for Russia and is of Russian descent. She is the longest reigning WBA female super middleweight champion and WBC female super middleweight champion. At the time of her retirement, she held all major female super middleweight titles and two heavyweight belts:
Document 7: Dauren Kurugliev: Dauren Khalidovich Kurugliev (Russian: Даурен Халидович Куруглиев ; 12 July 1992, Makhachkala) is a Lezgin heritage Dagestani-born Russian freestyle wrestler. 2017 European champion. He is Russian Junior National Champion 2011, North Caucasian Federal District Freestyle wrestling tournament winner 2011, 2013. National Master of Sports in Freestyle Wrestling. Kurugliev competed in the World Cup 2015 in Los Angeles, California and he won all the wrestling matches, 3-0. He defeated 3-time NCAA All-American champion Penn State Nittany Lions Wrestling Ed Ruth of USA (by fall), he won Usukhbaatar Purevee of Mongolia and Aleksander Gostiev of Belarus. He trains with world champion Abdusalam Gadisov. After American World Cup, In Russian National Freestyle Wrestling Championships 2015 he lost in the second round and was eliminated from the сhampionships. On 5 July 2015 on the Ali Aliyev Memorial he lost in the gold medal match to Shamil Kudiyamagomedov of Russia.
Document 8: Abdusalam Gadisov: Abdusalam Mamatkhanovich Gadisov (born 26 March 1989 in Dagestan) is an Avar – Dagestani born-Russian freestyle wrestler. He competed in the freestyle 96 kg event at the 2012 Summer Olympics; after defeating Taimuraz Tigiyev in the qualifications, he was eliminated by Reza Yazdani in the 1/8 finals. In 2014 he became World freestyle wrestling champion in 97 kg, and runner-up in 2015. In 2012 he became Russian national champion in final the match he defeated Olympic Champion and five time World Champion Khadzhimurat Gatsalov. He won Russian National Freestyle Wrestling Championships 2015 again and also won in 2016. Gadisov took the silver medal in the 2015 World Freestyle Wrestlng Championships, losing in the finals to Kyle Snyder, who became the youngest World Wrestling Champion in US history.He is devout Sunni Muslim
Document 9: Gadzhimurad Antigulov: Gadzhimurad Antigualov (Russian: Гаджимурад Антигулов ; born January 1, 1989) is a Russian mixed martial artist of Avar heritage who currently fights in Light Heavyweight division in the Ultimate Fighting Championship (UFC). He was the two times Light Heavyweight champion for Absolute Championship Berkut. He is currently the #15 ranked light heavyweight in UFC rankings as of 2 July 2017.
Document 10: Magomedrasul Gazimagomedov: Magomedrasul Mukhtarovich Gazimagomedov (Russian: Магомедрасул Мухтарович Газимагомедов ; born April 8, 1991 in Dagestan) is a Russian of Tindian heritage freestyle wrestler. Grand Master of Sports in Freestyle Wrestling. He is winner Russian National Freestyle Wrestling Championships 2015. In the quarterfinals match he beat to World Champion Khetag Tsabolov of North Ossetia–Alania. European Games champion, who competed in the men's freestyle 70 kg category at the 2015 European Games and won the gold medal. In preseason he trains with MMA stars Rustam Khabilov and Khabib Nurmagomedov. He won gold medal at the 2015 World Wrestling Championships at Men's freestyle 70 kg.
Document 11: KHK MMA: The Khalid Bin Hamad Al Khalifa Mixed Martial Arts (KHK MMA) is a martial arts organization based in Bahrain. It was founded under the patronage of His Highness Khalid bin Hamad Al Khalifa for its current CEO and professional MMA fighter Mohammed "The Hawk" Shahid in February 2015. Fighters competing under KHK MMA banner include: former UFC lightweight champion Frankie Edgar, UFC lightweight contender Khabib Nurmagomedov, UFC lightweight fighter Islam Makhachev, Bellator fighter James Gallagher, 2-time IMMAF champion Jose "Shorty" Torres, former UFC fighter and current Titan FC contender Alex Soto, and current Desert Force fighter Hamza Kooheji. KHK MMA activities include: coaching pro fighters, developing amateur MMA, promoting martial arts events, fitness gyms, and a sports gear brand.
Document 12: Silviu Vulc: Silviu Dorin Vulc more commonly known as Silviu Vulc is a Romanian heavyweight mixed martial artist. Silviu Vulc spent his early career boxing in Romania, he then moved to Russia to train with Red Devil Sport Club team mates with Fedor Emelianenko and Alexander Emelianenko. Vulc spent two years there training and fighting. During this time he had ten MMA fights with eight wins and three losses, the first seven fights being semi-professional before moving into the professional league. Vulc had a short professional career, defeating Rodrigo Mendes in the Desert Combat Challenge in Israel and losing twice. His last fight being in 2008 for M-1 Global. Silviu has spent most of his time and energy over the years coaching others in boxing and MMA around the world including time spent in Russia, Romania and London, England.
Document 13: Artem Vakhitov: Artem Olegovich Vakhitov (Russian: Артё́м Оле́гович Вахитов , "Artёm Olegovich Vahitov" ; born April 4, 1991) is a Russian Muay Thai kickboxer who competes in the cruiserweight and heavyweight divisions. Having begun practicing Muay Thai at eleven years old, Vakhitov first came to prominence due to a successful amateur career by winning four IFMA European and three world championships as well as taking silver at the World Combat Games in 2010 and gold in 2013. He turned professional in 2009, and signed with Glory in 2013 after becoming the WMC European Super Light Heavyweight Champion. He is currently ranked the #1 light heavyweight in the world by LiverKick.com, Combat Press and GLORY. Vakhitov is the current Glory Light Heavyweight Champion.
Document 14: Valeria Koblova: Valeria Sergeyevna Koblova, née Zholobova (Russian: Валерия Сергеевна Коблова ; born 9 October 1992 in Moscow Oblast) is a Russian freestyle wrestler. She competed in the freestyle 55 kg event at the 2012 Summer Olympics; she advanced to the bronze medal match, where she was defeated by Yuliya Ratkevich. At the 2014 World Wrestling Championships she lost in the final match to 10-time World champion and 4-time Olympic champion Kaori Icho. At the 2016 Summer Olympics she lost in the gold medal match to Kaori Icho. She is Grand Master of Sports in freestyle wrestling.
Document 15: Albert Saritov: Albert Ramazanovich Saritov (Russian: Альберт Рамазанович Саритов ; born July 8, 1985 in Khasavyurt) is a Russian Naturalized Romanian freestyle wrestler of Chechen descent. 2016 Olympics bronze medalist, bronze medalist World Wrestling Championships 2011 in Istanbul, Turkey. Ramzan Kadyrov & Adlan Varayev cup 2012 winner, Golden Grand Prix Ivan Yarygin 2011 runner-up and winner Ali Aliyev Memorial 2014. He representing for Mindiashvili wrestling academy.
ground_truth: Islam Makhachev