Crazy as things are going I am expecting Russia to declare that as kind of allied declaration against them.
Having Cold War situations again isn't desirable of course but it's kind of battle tested to not lead to further, direct, escalations.
I do realise the risk of nukes at that point but in the hypothetical situation that nukes remain MAD
Also it is quite clear Putin won't lose his face no matter what, and has reached the point of better dead than sorry.
Very sadly how many has he already taken down with such attitude.