Actually, "Russia as you know it" never existed. And no, as the EU openly declared "decolonisation of Russia" as their strategic goal, fighting back might become the only option to save "Russia as Russians want to see it".
Really? Ok. You are suffering coordinated sophisticated attack from Russia, China and North Korea. Most of your silos, bombers and submarines are eliminated by their first strike (like in "First Strike" (1979) movie). You still have two Ohio-class submarines in Atlantic (with 15 minutes of preparation to launch and 45 minutes of flight time), 20 Trident II missiles (with 3 100 kt W76-1 warhead each) each. It gives you 120 warheads totally. Moscow's ABD can intercept 100 warheads with high certainty and up to 200 warheads with moderate certainty. So, if you retaliate - you'll kill some Russians, but no more than 10 mln. Likely - lesser than 1 mln. And as Russians took initiative - they already have state-essential personal and members of their families evacuated and sheltered.
Russia is big. Good luck with destruction of it with mere few hundred warheads. And don't forget about China, Europe, India and other countries who will come after you when you are running out of nukes.