whether this is "real" or not, Ukraine certainly has an active program to debrief or even deprogram Russian soldiers... I sure we have all seen those interviews on youtube... Its not surprising to think that some significant percentage of those Russian soldiers in Ukrainian captivity could end up being violently opposed to the war and to Putin, and willing to do something about it.
Hopefully, anyways. I know a vocal majority here hate all Russians and probably think they are too brainwashed for something like this.