If you're new to the lore, Bandera is actually kind of a cornerstone of ukro-nazi ideology. There was even a Ukrainian diplomat who got on a German radio show and denied Bandera being a perpetrator of the Holocaust (ordering his followers to exterminate Jews, Poles, Russians, etc.) He was later re-assigned to some other position because Poles and Germans were very upset by this.

But that's overly specific, more broadly you can see OUN iconography all over Azov fashion and even that slogan "Slava Uka'ini!" that they got liberals repeating is heavily associated with the Banderites. Honestly it's just an endless stream of this shit, including Zelensky himself defending the cult of personality around, I again must emphasize, this leader of Holocaust perpetrators.