Not necessarily a wise move when your military is outnumbered more than 10:1 . . .
Russia can’t throw “everything” at Ukraine. Not even close. They have too many other spots just waiting to boil over. If Ukraine can accept a 10:1 kill ratio (in favor of Russia), interrupt the gas pipelines (best done in Western Ukraine), accept the loss of up to 1% of their population (they lost 19% in WW2 and gained NOTHING), and basically just “tarball” the Russkis, Putin is in big trouble, in the long run.
Unfortunately, in the rest of the world, in the next decade, given the vaccuum the US is creating, there will be a huge arms race including nukes in several cases, and no way does that end well.