Ofc, russian scum "found" some "clues" that this ukrainians who shoot prison camp. This is so logical: we are shooting warehouses and command bunkers, but now for some reasons we shoot prison camp where our captive soldiers. Yep, sounds legit *sarcasm*
As I said above, this is clear message:
"Our you stop using HIMARS, or we execute all captive ukrainian soldiers" Clear message: "Don't you see? We don't want to kill you. That's why we have prison camps.
"Stop fighting. Lay down your arms and surrender. This way we can all go home, and you will have some soldiers left to start over Ukrainian life with.
"But if you won't stop fighting, we just might kill all your guys in our prison camps, and wipe the rest of you off the face of the earth."

It's ironic they're accusing Ukraine of doing literally what Stalin did.