Question: What nationality is the man whom Vladimir Kozlov won the WWE Tag Team Championship with?

full_context: Document 1: Wladimir Klitschko: Wladimir Wladimirowitsch Klitschko (born 25 March 1976) is a Ukrainian former professional boxer who competed from 1996 to 2017. He is a two-time world heavyweight champion, having held the WBA (Super), IBF and WBO titles, as well as the IBO, "Ring" magazine, and lineal titles. A strategic and intelligent boxer, Klitschko is considered to be one of the greatest heavyweight champions of all time. He was known for his exceptional knockout power, utilising a strong jab, straight right hand and left hook.
Document 2: Santino Marella: Anthony Carelli (born March 14, 1974) is a Canadian sports analyst, trainer, entrepreneur, actor, and retired professional wrestler and mixed martial artist, who currently works for the Canadian sports TV network Sportsnet. He is best known for his 11-year tenure in WWE, most notably under the ring name Santino Marella. He is the founder of Canadian martial arts and professional wrestling training facility Battle Arts Academy.
Document 3: 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 4: Antonio McKee: Antonio De Carlo McKee (born March 12, 1970) is an American mixed martial artist who competes in the Lightweight division and is the former Maximum Fighting Championship Lightweight Champion. He has also competed in the UFC, the Tokyo Sabres in the IFL, Dream, K-1 Hero's, King of the Cage, World Fighting Alliance, and is currently signed to the World Series of Fighting organization.
Document 5: Wolfslair MMA Academy: The Wolfslair MMA Academy is a fight team and training camp for mixed martial artists and kickboxers, headquartered in Widnes, England. The school was founded by Liverpool MMA fans Anthony McGann and Lee Gwynn. The academy earned publicity from their signing of former UFC light heavyweight champion Quinton Jackson, former UFC heavyweight Cheick Kongo, and current UFC middleweight champion Michael Bisping to training and managerial contracts. With these signings, Wolfslair became noted as one of the most prominent training stables in the UK's MMA scene.
Document 6: John Cena: John Felix Anthony Cena ( ; born April 23, 1977) is an American professional wrestler, rapper, actor, and reality television show host. He is currently signed to WWE, where he is a free agent, appearing for both the Raw and SmackDown brands. Cena started his professional wrestling career in 1999 with Ultimate Pro Wrestling (UPW) and won the UPW Heavyweight Championship the following year. Cena signed a developmental contract with the World Wrestling Federation (WWF, later renamed to World Wrestling Entertainment, or simply WWE) in 2001, debuting on the WWE main roster in 2002.
Document 7: American Combat Association: The American Combat Association is a small mixed martial arts company founded by Olympic wrestler, world Abu Dhabi champion and UFC fighter Kamal Shalorus and professional mixed martial arts fighter, Broadcaster and American professional wrestler Matthew "The Granimal" Granahan. 
Document 8: Igor Vovchanchyn: Igor Yaroslavovych Vovchanchyn (Ukrainian: Ігор Ярославович Вовчанчин ; born August 6, 1973) is a retired Ukrainian mixed martial artist and kickboxer. After making his professional MMA debut in 1995, he won nine mixed martial arts tournaments, 3 superfights, holds the second longest unbeaten streak in MMA (at 37 fights), has the 6th most wins in MMA (61), and reached the final of the PRIDE 2000 Openweight Grand Prix. He is widely considered an MMA legend, and in Ukraine he even has a tournament named after him, the "Igor Vovchanchyn Cup".
Document 9: Ivan Pravilov: Ivan Pravilov (Ukrainian: Іван Правілов ; January 1963 – February 10, 2012) was a Ukrainian ice hockey coach. Pravilov also trained a number of young players in the National Hockey League, including Dainius Zubrus and Andrei Zyuzin. He had coached a Ukrainian hockey school, Druzhba-78 before he moved to the United States in 2007.
Document 10: Vladimir Kozlov: Oleg Aleksandrovich Prudius (Russian: Олег Александрович Прудиус ; Ukrainian: Олег Олександрович Прудіус , "Oleh Oleksandrovych Prudius"; born April 27, 1979) better known by his ring name Vladimir Kozlov, is a Ukrainian-American producer and retired professional wrestler. He is best known for his time in WWE, where he won the WWE Tag Team Championship once with Santino Marella. He is trained in freestyle wrestling, rugby, football, sambo, kickboxing, judo, jujutsu, Brazilian jiu-jitsu and mixed martial arts.
Document 11: Kurt Angle: Kurt Steven Angle (born December 9, 1968) is an American professional wrestler, actor and retired amateur wrestler currently signed to WWE and performing as the on-screen general manager for the Raw brand. While a student at Clarion University of Pennsylvania, Angle won numerous accolades, including being a two-time National Collegiate Athletic Association (NCAA) Division I Heavyweight Wrestling Champion. After graduating college, Angle won a gold medal in freestyle wrestling at the 1995 World Wrestling Championships. He then won a freestyle wrestling gold medal at the 1996 Summer Olympics. Angle is one of four people to complete an amateur wrestling Grand Slam (Junior Nationals, NCAA, World Championships, and Olympics). In 2006, he was named by USA Wrestling as the greatest shoot wrestler ever and one of the top 15 college wrestlers of all time. He was inducted into the International Sports Hall of Fame in 2016 for his amateur accomplishments.
Document 12: Klitschko brothers: Vitali Klitschko (born 19 July 1971) and Wladimir Klitschko (born 25 March 1976), collectively known as the Klitschko brothers are Ukrainian heavyweight boxers. During their peak years from 2004 until 2015, the Klitschko brothers were considered the most dominant heavyweight champions of their era, and amongst the most successful champions in boxing history. After the retirement of boxing legend Lennox Lewis, the Klitschko brothers held all heavyweight boxing world titles. Known for their exceptionally large frames and robotic boxing styles, the Klitschko brothers developed a style that utilized their athleticism and using their reach to break down opponents.
Document 13: Oleksiy Oliynyk: Oleksiy Oleksiyovych Oliynyk (Ukrainian: Олексі́й Олексі́йович Олі́йник , born June 20, 1977; Russified to Alexey Alexeievich Oleinik, Russian: Алексей Алексеевич Олейник ) is a Ukrainian-Russian mixed martial artist, jujitsuka, combat sambist and grappler currently signed with the Ultimate Fighting Championship, competing in their heavyweight division. A professional competitor who began his career in 1997, he is a M-1 Global veteran and has fought for Bellator, KSW, BodogFIGHT, and YAMMA Pit Fighting. As of July 2017, he is #11 in the official UFC heavyweight rankings. He is the only fighter to win a UFC fight via Ezekiel choke and also holds the record for most Ezekiel choke wins in MMA competition, with ten.
Document 14: Matt Serra: Matthew John Serra (born June 2, 1974) is an American former professional mixed martial artist, Brazilian Jiu-Jitsu practitioner who competed for the Ultimate Fighting Championship and stand up comic. He currently serves as a UFC on FOX analyst. Serra defeated Pete Spratt, Shonie Carter and Chris Lytle en route to becoming The Ultimate Fighter 4 Welterweight Tournament Winner. He captured the UFC Welterweight Championship immediately after, becoming the first of only four to win both accolades (along with Forrest Griffin, Rashad Evans, Michael Bisping). Serra also served as the head coach for "The Ultimate Fighter 6" reality show opposite Matt Hughes. In Brazilian Jiu-Jitsu, Serra holds a Silver Medal in the ADCC Submission Wrestling World Championship.
Document 15: Xtreme Couture Mixed Martial Arts: Xtreme Couture Mixed Martial Arts is an American mixed martial arts training organization headed by former UFC Champion and former co-founder of Team Quest, Randy Couture. Xtreme Couture was founded with the flagship gym in Las Vegas. Since then, the franchise has spread to other cities in the United States and Canada. Xtreme Couture Las Vegas is one of the largest gyms (over 24000 sqft ), most recognized brands and MMA gyms in the world where many past and current top MMA fighters train.
ground_truth: Canadian