Why Is the Russian Federation Lined as an Eternal Enemy?

Why is the russian federation side lined as an eternal enemy by the entire western world, in spite of them belonging to the same ethenicity and religion? They even fought on the same side in the world wars. And weren't they better off being allies of russia, considering their national interests, instead of facing a constant threat from it? To understand the situation, we ought to again look at history, the past thousand years of history. It's a story of ethnic strife, ethnic hatred. There are lots of elements of paganism in that yer below the surface. Western europe sees russia as part of the east, tnically, culturally, et cetera