Ukrainian slider wears helmet despite IOC ban
They ended up banning him for a different reason: www.bbc.com/sport/articles/c309pj8d8qqo
The IOC added that Heraskevych had been banned for contravening athlete guidelines, rather than because of displaying political propaganda.

Ukrainian skeleton race Vladyslav Heraskevych is banned from competing at the Winter Olympics for continuing to wear a helmet which features images of athletes killed during Russia's invasion of his home country.