They’re in the process of shoveling fortunes into a ravenous private sector arms industry.
Russia can’t take all of the EU or European NATO countries at once
None of these countries want a repeat of WW2. Quite a few have large right wing nationalist blocks sympathetic to Putin’s United Russia white nationalist model.
This won’t be a fight between Russia and the EU. It will be a war of economic attrition that favors the international arms industry and cripples the domestic service sector, to the outrage of domestic people.