If putin has a bad bowel movement he might justify nukes. Paper & laws from russia are not worth the bits of bandwidth they are reported on. izs a dictatorship .
Biden has delivered a master class in how to stand up to a bully. Put a toe just barely over the line in the sand. If the bully reacts then it's an obvious overreaction and you can respond in kind without seeming a bully or irrational yourself. If the bully doesn't react do it again. And again. And again. And again.
Unfortunately that strategy is not going to continue.