The nazi rhetoric shows that Putin has been observing US leftist media and noted how effective labeling someone with that term can be. If you want to know where he came up with it, look no further than CNN and their siblings in the US. It’s a bit comical to label the Jewish president and Jewish Prime Minister of Ukraine as nazis, but that’s where we are in this theater of the absurd. As others have noted the differences between Nazism and communism are small, the important tenets are nearly identical.
Thanks.