She is an Olympic champion and silver medallist in the team sabre event.

Komashchuk won the gold medal in the team sabre event at the 2024 Summer Olympics and the silver medal in the team sabre event at the 2016 Summer Olympics.

[6] In April 2013, Komashchuk won the gold medal in the Women's Sabre at the 2013 Junior and Cadet World Championship, held in the Croatian town of Poreč.

[7][8] On 12 August 2013 she won the Gold medal (with Olha Kharlan, Halyna Pundyk and Olena Voronina) at the Women's team sabre at the 2013 World Fencing Championships in Budapest, Hungary.

[9] During the 2012–13 season Komashchuk was ranked 4th in the World in the Women's Junior Individual Sabre classement by the Federation Internationale d'Escrime (FIE).