Career
She has swum at the:
Olympics: 2000, 2004, 2012
World Championships: 2003, 2005, 2009, 2011, 2013
European Championships: 2010
Open Water Worlds: 2008, 2010
She swam for Ukraine at her first Olympic Games in 2000, at the age of 15. And at her second Olympics in 2004. At the 2003 World Championships, she set the Ukraine Record in the 1500 free (16:2776).
After the 2004 Olympics, she change sport nationality to Israel.
After failing to qualify for the 2008 Olympics, Beresnyeva returned to Ukraine. Originally a distance swimmer in the pool, she began swimming open water races in 2008.
She swam in her third Olympics in 2012, swimming the Open Water event, but was disqualified and excluded from the Games by the International Olympic Committee in June 2015 after re-analysis of a drug test showed she had been doping.