Rightwingers from world over have been attracted by explosion of azov battalion popularity on social media in past years. Like it did for ISIS, Doesn't mean a cent in context of war between two 21st century countries. Yes they will inflict casualties, but without a states backing will probably bleed out in a back alley.
The worst thing to do would be inviting mercenaries to your own country and asking them to fight your war. Once these foreigners start pouring in then this conflict can take any shape and any form. There are some really serious doomsday prophecies which people believe and this can be a perfect start to it.
Russia may have suffered casualties and destroyed equipment, but her citizens and infrastructure are safe. Ukrainians either throw their president out or start fighting themselves. They need to understand it is only them who are suffering and will suffer if this conflict doesn't end soon, the others are just betting like they do on a horse race.
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Russia has been planning all this for a very long time, they must considered many options, scenarios and outcomes and changing strategies ........... would they have also tried heavy infiltration and bought sell outs? Whatever they are doing doesn't make any clear sense as of yet. Suppose they are successful in overthrowing current Ukrainian govt. setup who are they going to install?