Also, I should mention- I don't like the idea of Poles on Poles. Those "Little Green Men" that you heard about in Crimea is kinda my interpretation for what Jan and his team are up against, as well as some defectors that are referenced in the radio (ie. the Lieutenant Colonel, and perhaps a minority of forces)- but Polish identity is strong, we've never really let the Soviet culture/Russian language in like parts of Ukraine have, so it's less plausible to me that there would be lots and lots of Polish rebels (and this isn't just bias speaking- us Poles have a genuine hatred of Russia that I think eclipses much of the West, even in Communist times (in a way). I assume this is more of a minority thing, and rather, CSTO is using that to plug in their own "militants" of Russian type, who aren't maybe even Polish, and as you saw, the VDV and various formations that are steamrollering the first line of defense of Polish forces in the east.