If it's "Putin's narrative" that wars start for more complex reasons than "some nations are just evil and bad" then I fear he just has a better understanding of how the world works than someone who accepts that premise. Some nations being simply evil and bad is the type of thinking that fascists actively encourage. Do not fall for it. At least attempt to develop an understanding of the real material reasons for international military conflict.
I probably hate the Russian ruling class more than you and for better reasons but that's no reason to simplify geopolitics to such a degree.