[MichaelZuo]

It seems possible for the Russian decision makers to be so angered that they will want to take revenge, to spend their built up political/technological/social/cultural capital to intentionally weaken the US, EU, etc.

Nuclear weapons are practically an all-or-nothing proposition, but nowadays there a lot of other ways to deliver some intermediate amount of 'revenge'.

And it's a lot easier to destroy then create, as the war has shown, I estimate the asymmetry is easily 100 to 1. That is to say $1 of novichok, or whatever nasty means, can easily cause $100 worth of damage, and the combined economic size difference isn't even 20 to 1.

Though I'm just spitballing the numbers here.