War would have been won if not for stab in the back. Same as Germany post-ww1 rise of Nazis.
That won't help Putin, though (probably). He's probably fatally weakened by all this, as the Kaiser didn't remain in power past the end of WWI. What it will do is provide nationalistic fodder for the next nationalistic firebrand in 20 years.
It wouldn't help Putin to win.
It only helps to keep his face and spirit up in case he loses.