I tend to a different view: He knows about the embezzlement and is complicit in it. He just thought that irrespective, he would win in 72 hours. Once it became obvious he wouldn't win in 72 hours he had to move to a different strategy, but it doesn't end the war, or save lives. Again, he's not un-aware of things on the ground within the limits of what higher command are told. He can read any western media he likes, and to believe he isn't aware of the other feed of intel is to seriously under-rate how things work.
So now to bribes: Does anyone think that any war of this nature has succeeded purely by undermining the authority of the opposition by bribes? It helps motivate, but I don't think it can explain things. Dark, off-book money always leaks, the final target never gets 100% of the "moscow gold" sent down the pipeline. Anyone who thinks bribers are un-aware of the road tax on illegal money has never experienced illegal money flows.
TL;DR Putin is not unware of the state of battle, or preparedness of his troops. Bribes alone wouldn't have made it work, magically.