They can't win a war but they can end the world as we know it. Lavrov said WW3 will be nuclear.
https://www.reuters.com/world/russias-lavrov-says-third-worl...
https://www.reuters.com/world/russias-lavrov-says-third-worl...
If the Ukraine invasion is any indication of the might of Russia's military, it has demonstrated that Russia's might is largely tanks and mobile missile launchers. The US has assets in the air, on the ground and off the coast of Russia right now that are ready to redefine the meaning of "shock and awe" at the first sign of nuclear use. Putin has one chance to get his missiles off the ground before complete annihilation in a matter of minutes.
Once a massive nuclear attack starts, the only options are massively launching back, or not answering and hoping for the best, both for your country and the planet.