If you have been following the Ukrainian thread since Crimea....the initial Russia invasion of Donbass was well on the other side of 15,000 troops all taken from their professional contract side of the house...some estimates placed the number closer to 17,000.
After the UAF was soundly beaten in an 2014 encirclement most of the invasion troops withdrew to just over the border...leaving a remaining 11,000 inside...that number has sunken to around 5-8,000 depending on what Russia is trying to pressure Ukraine on....
Remember in the initial Russian invasion UAF artillery mainly BM27s caught a Russian mech brigade on the move and Russian loses with wounded were in the range of 200 and ten were captured...virtually wiping out a Tactical BN....
Currently a stable 5,000 is in place...largely separatist unit commanders and XOs and logistics support...coupled with a Spetsnaz Brigade with artillery and armored units .....with elements of recce (UAV/EW) and logistics.....a large number of Russian trainers are "hidden" in the separatist units....
I have been retro posting info that now is being taken from Russian VK accounts and Ukrainian social media analysts are slowly piecing together the actual invasion units....and they talk about brigades not BNs......meaning multiple different BNs forming a common Russian brigade under command of that actual brigade commander...
Right now there is a stand off with spetsnaz...Russian spetsnaz has not launched any attacks in over two full months due to an ambush that caught and killed two full teams and the Russians are unsure just how the UAF found them...
Your last question is easy to answer....they are considered to be combat trained and experienced and if they are Russian usually spetsnaz, artillery and recce (UAV/EW types)....if separatists then with Russian PMU Wagner...
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