If Russia and the west start shooting eachother, one of four things will happen.
1 - Russia grows a brain and backs down when they horribly lose a conventional war. (Unlikely, unless someone takes command authority away)
2 - Russia kept their nuclear arsenal up to date, and a tiny remnant.of humanity gets to enjoy the Stone Age again. It won't hurt if you live in a city though.
3 - Only a tiny fraction of their nukes launch, and the west responds proportionally. A lot of people die, but at least we'll fix global warming.
The world of a hundred years ago. Where I live, the liberal parties mostly want to create more freedom for companies to fuck people over.