So is the Wagner group with the Russian government. Your point being?
> videos of pow torture
As per the Russians, this is not a war. Hence, they're not prisoners of war. Or we can have our cake and eat it too? If something bad happens to a Russian soldier on Ukrainian territory, that's that all part of a 'Special Hospitality Operation'.
In terms of your second point, no.
https://en.wikipedia.org/wiki/Russian_military_deception
By default, the Russians are lying, unless there's evidence that they're not. They lied about Crimea, they lied about invading Ukraine, they lied about the refugee corridors, they basically lied about everything, if it suited their goals. They're lying right now. Satellite images show that the mass graves were there since before the Russians left Bucha. What they did there is something all Eastern Europeans who had ancestors 'liberated' by the Russians know too well.. Not to minimize the current tragedy, but this is tame compared to the past exploits of the Red Army. I bet this is just the tip of the iceberg and that the south-east of Ukraine is pretty much hell on earth right now.