"They were the regiment Ukraine sent to Mariupol to defend it, which is why Russia was so determined to win there and ship all the surrendered Azov army prisoners to Russia." ...
Sorry Flecc, again a slight egging of the pudding. At 2014 era, Russia did attack Mariupol in the intentions of establishing a land route to Crimea . Russia was flustrated by the heroism of a far right NATIONALIST group ..with a NAZI far right ideology. To the Russians, being Nationalist was equally as obnoxious as Nazi ..only Russians are entitled to be Nationalist . Remember in 2014 the Ukrainian military was a shambles, so a volunteer gang of defenders ,defending THEIR TOWN , was a godsend.
They did succeed , against all the odds in fighting off that invasion. Putin never forgives a slight... . By 2021, they were FUlly Integrated into the Ukrainian Army as a regular unit and located in Mariupol. Their so called "nazism " had been curbed and was more part of mainstream Ukrainian thinking or more likely, the rest of Ukrainian society had been developing a sense of National Identity over the years, They weren't sent to Mariupol , they were located there.