so the skaters decided to train with Shpilband in Novi, Michigan. At a camp in Bulgaria, Tkachenko lost his balance while practicing a lift on the floor in skates and stepped on Riazanova's hand; she had surgery on her hand and recovered well. At the suggestion of Tatiana Tarasova, they decided to scrap a new free dance to Pink Floyd's Hey You and made a new one to a waltz from the Godfather films. Riazanova/Tkachenko won bronze medals at the 2012 Skate Canada and 2012 Trophée Eric Bompard. They repeated as bronze medalists at the 2013 Russian Championships. 2013–2014 season Riazanova/Tkachenko finished fourth at their two Grand Prix events, the 2013 Skate Canada International and the 2013 Rostelecom Cup. They then finished fourth at the 2014 Russian Championships behind Victoria Sinitsina / Ruslan Zhiganshin. In April 2014, Tkachenko left the partnership. 2014–2015 season Tkachenko and Isabella Tobias teamed up in the summer of 2014 to represent Israel. They had skated together for six months in 2008. On their decision regarding which country to represent, Tobias stated: "The U.S. would have granted him citizenship one year too late at best; Russia wanted me to give away my American passport, which I would never do; and the experts we consulted assured (us) that Lithuania would never grant him citizenship (I barely got mine). So we chose Israel, as I am of Jewish origin, and Ilia has also some Jewish roots via his mother, which makes it easier." The two sat out the 2014–2015 season in order to become eligible to compete for the following season. 2015–2016 season: Debut of Tobias/Tkachenko Tobias/Tkachenko began the season on the Challenger Series (CS), winning silver medals at the Finlandia Trophy and Mordovian Ornament. They placed 10th at the 2016 European Championships in Bratislava, Slovakia, and 12th at the 2016 World Championships in Boston, United States. They were coached by Igor Shpilband and Adrienne Lenda in Novi, Michigan. 2016–2017 season Tobias/Tkachenko ranked 4th at the 2016 CS Autumn Classic International in Canada before making their Grand Prix debut as a team. After placing 6th at the 2016 Skate America and 5th at the 2016 Trophée de France, they won silver behind Elena Ilinykh / Ruslan Zhiganshin at the 2016 CS Tallinn Trophy. The two placed 12th at the 2017 World Championships in Helsinki, Finland. Due to their result, Israel qualified a spot in the ice dancing event