Bandera is celebrated in today's Ukraine as a national independence hero who fought against Soviet occupation and with the election of Zelensky and the incorporation of the Azov battalion into the Ukrainian armed forces, the Banderites have increased their influence in Ukrainian society, army and government. The massacres against the Poles by the UPA resulted in approx. 100,000 murdered Poles. Bandera was imprisoned by Hitler after he tried to declare an independent Ukrainian state, moved to a concentration camp, treated like an "honor prisoner", tried in absentia by the Soviet union after WWII and murdered by a KGB agent in Munich. Putin has named the takeover of Ukraine by "neo-nazis, banderites" as one reason for his war of aggression.
All of this has caused a massive diplomatic scandal between Ukraine and Poland, two nations who just recently found common ground in their opposition to Russian aggression. The ridiculous part is that the current war has produced plenty of national heroes in Ukraine and it would be fair to name the military unit after one of them instead of a nationalist with an ambivalent past.