Russian presence there was documented by multiple sources - i at the time saw much from Telegram, Ukrainian and oppositional Russian sources - and here for example is more typical Western source:
https://www.npr.org/2022/04/07/1091396292/satellite-photo-sh...
I saw many times people just doubt that story without any specific reason, and i'm yet to hear what specifically they doubt - the radiation levels? Russian presence? or may be the arithmetic of the levels multiplied by the length of the presence?
Which I personally would doubt. Such a determination could only be made by on-site measurements. By now, radiation should be highly localized in certain areas and soil formations through rain wash-off and intentional burying of contaminated surfaces. So while a lot of places might be harmless, there should be some that are definitely not.
Whats more, the red forest due to proximity and wind conditions, got the major part of the heavier isotopes. The combination of those can be extra-nasty due to their gamma energy, bioavailability and half-life when compared to the lighter stuff that spread out over Europe.
Yes, my link contains facts - the images - and statements by the "experts" who somehow didn't provide any numbers to support their opinion. I posted it for the facts while naturally expecting that people here would be able to separate chuff from the real stuff just like you did.
Wrt. "psychosomatic response" - that takes the crown. Whatever "expert" conjured it, s/he never seen Russian army where basic everyday soldier existence is one continuous "psychosomatic response".
https://www.reddit.com/r/chernobyl/comments/twab17/is_radiat...
> there are no photos or eyewitness accounts.
The other resources provide satellite images of excavations and eyewitness accounts from Ukrainian hunters and biologists.
Anyway. Do your own research, come to your own conclusions.