Russia has no interest in attacking Europe. US/NATO is the executive arm of longterm geopolitical interests that strive for total global dominance. They utilize sophisticated multipronged longterm strategies attempting to bring the rest of the planet under their control. Russia is a small part of that parcel.

The ultima ratio regum part of it considers some geographies more expendable than others. Egress of core industries from the EU is deliberate part of the strategy. Vassals are ruled by compradors, so populations are captive. It's direct oligarch control on the other side, so it's simpler.

MAD still applies. Both sides go to great lengths to avoid it, since the outcome is deterministic and global. Which is why the US would be a second target, if not already part of first strategic strike.

Wars are confusing places, so potential for fatal mistakes is exponentiated.