Oksana KhvostenkoOksana Khvostenko is a Ukrainian biathlete. She is a multiple medalist at the World Championships. In 2008 together with Andriy Deryzemlya she won World Team Challenge.Anti-doping rule violationKhvostenko tested positive for ephedrine at a post event doping control at the World Championships 2011 where the Ukrainian team had finished second in the Women's Relay. The team was later disqualified because of the anti-doping rule violation and Khyostenko received a one-year ban from sport, commencing on 13 March 2011.Personal lifeSince 2001, she is married to Ukrainian biathlete Vyacheslav Derkach.CareerWorld Championships 2003 - Silver medal on the relay 2008 - Bronze medal, Sprint 2008 - Bronze medal, Individual 2008 - Silver medal on the relay