

I doubt they really have plans that far, and if they do, I doubt that a full on war to destroy western Europe would be that plan, vs trying the same tactics to manipulate the population as have been tried on the US. The US, and Russia, have the capacity, at least from their nuclear arsenals, to destroy Europe, certainly, but that capacity exists within Europe too. A full on war with Europe is unlikely for the same reason that a full on war between the US and the Soviet Union did not occur.
Beyond that, it should be considered that shared autocracy is not a particularly great incentive for alliance. It can represent a source of common interest for the elite against anything that threatens autocracy in general, but beyond that, there is no reason for an oligarch in one country to not see an oligarch in another power as much more than competition. If you want to own and control all you can, someone else also doing that is to be regarded with suspicion, not natural trust.
I’ve generally heard the origin explained as coming from an offshoot of the general scifi community in the late 70s to early 80. There are a lot of animal people in sci fi (things like aliens designed after animal people, or stories about animals given human traits and characteristics, or people being spliced with animal dna), and fantasy stuff which has a related audience, and some people particularly liked that trope.