The whole Russian military is predicated on the principle that Mother Russia does not care whether you love her, want to protect her, and want to achieve gloriously in her defense. The Russian army is predicated on throwing numbers at the problem. Been that way for centuries. A disproportionate amount of "Russian" soldiers are Tatars, Bashkirs, Buryats, Kumyks, etc.I am not well versed in this but I do believe that there are fewer and fewer Russians and North Koreas desiring to die in Ukraine and this has manifested itself in overall ineffectiveness and massive loss of Russian equipment in the battlefield.
It could well be that Great Russians are seething under Putin's oppressions and ready for a change in government, but we won't know that for sure until the bubble bursts and everyone jumps ship.
That could be true. It could also be true that Oligarch A covets Oligarch B's business empire and plants some evidence and then rats him out to The Boss.I do interpret, perhaps wrongly, the the number of "suicides" by oligarcs in Russia is and indication of Putin's war not being seen as conducive to their business interest.