which competition did Ekaterina Vasilieva compete in pairs with the russian pair skater who teamed up with Yuko Kavaguti and win 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) ?