Leantsiuk came third at the Belarusian championships in 2003 and won the national junior title with a new best throw of 17.44 m (57 ft 2+1⁄2 in).[4] She was runner-up to Russian rival Anna Avdeyeva at the 2003 European Athletics Junior Championships.[5] She did not improve in 2004 – her first year of full senior competition – but managed a throw of 17.91 m (58 ft 9 in) at the 2005 European Athletics U23 Championships, taking fourth place.[6] She cleared eighteen metres for the first time in 2006 and ended the year with an improved personal best of 18.86 m (61 ft 10+1⁄2 in).[3] She was also second in the First League meeting of the 2006 European Cup.[4]
She did not return immediately after her ban and finally returned to track and field at the beginning of 2013. She opened with a throw of 18.47 m (60 ft 7 in), but that was her best that year and she threw beyond eighteen metres only a handful of times. She came sixth at the 2013 European Team Championships and had two podium finishes at the Belarusian National Championships: she was runner-up in the shot put but also took third in the discus throw, managing a best of 47.07 m (154 ft 5 in) for the new event. She represented Belarus in the shot put at the 2013 World Championships in Athletics, but did not progress beyond the qualifying round. Leantsiuk began 2014 in personal best form, throwing 18.70 m (61 ft 4 in) for second at the national indoor championships, then an indoor best of 18.85 m (61 ft 10 in) at the 2014 IAAF World Indoor Championships was enough to reach the World Indoor final.[4] She did not throw as far in the final, however, and finished seventh.[3]
