[2][3][4] Nikishyn won a bronze medal in the team men's épée event at the 2006 World Fencing Championships in Turin, Italy,[5][6] a silver medal in the team men's épée event at the 2013 World Fencing Championships in Budapest, Hungary,[7][8] a gold medal in the team men's épée event at the 2015 World Fencing Championships in Moscow, Russia,[9][10] a bronze medal in the individual men's épée event at the 2018 World Fencing Championships in Wuxi, China,[11] and a silver medal in the team men's épée event at the 2019 World Fencing Championships in Budapest, Hungary.

[12][13] Nikishyn won a bronze medal in the individual men's épée event at the 2016 European Fencing Championships in Toruń, Poland, and a bronze medal in the individual men's épée event at the 2018 European Fencing Championships in Novi Sad, Serbia.

At the 2013 World Championships in Budapest Nikishyn lost in the first round to Spain's José Luis Abajo.

Hungary won scoring 42–38 and Ukraine took a silver medal, the best result in Ukrainian history for men's team épée.

The Ukrainian team lost to world No.1 France in the semifinals, then to hosts Switzerland and finished fourth.

[19] Nikishyn entered the match last when the score was 11–7 and, defending against Jung Seung-hwa's attacks, finished on 34–24, allowing Ukraine to win their first world title in men's fencing.

In personal Bogdan defeated such rivals as: Bartosz Pisetsky (15:6), Gabor Boczko (10:9), Paolo Pizzo (15:6) and Géza Imre (15:11).