And he emphasized: They are BADASSES. Apparently they were winning the war with Russia until Russia cut a "Red Wedding" deal with the non-muslim contingent of the Chechen resistance. I believe Chechens were in ISIS/Syria and were basically the most effective soldiers.
As you said this could become a perverse version of ISIS: a call to arms to anyone that wants a piece of Russia, from bored teenagers to other conflict regions.
Maybe it's been sufficiently long that those soldiers have finally aged out, or maybe they haven't.
If Ukraine/NATO really is offering 45000 Euros in bitcoin per Russia soldier that surrenders for POW status, then they would probably provide pay to experienced anti-Russia fighters.
If you are a -stan with issues with Russia, then this is a golden opportunity: a possible "death blow" to Russia militarily and economically, possibly cause regime change, and possibly destroy any appetite for war by oligarchs and people in Russia.
That's about two infantry divisions - not to be sneezed at.
Also curious to know how many unofficial troops from NATO countries show up. Russia’s neighbours aren’t fans, and bored Slav, Baltic, and Scandi kids who did military service and wanna be heroes showing up in great numbers isn’t outside the realm of possibility