 Between 2008 and 2020, Nikishyn won four FIE Men's Épée World Cup titles, in addition to four silver medals and three bronze medals.Nikishyn took up fencing at the age of ten after he came by chance to a fencing training.He won a team silver medal at the 1998 Junior World Championships in Keszthely and joined the senior national team for the 2001 World Championships in Nîmes.