Do I understand correctly that what you propose is making this derailed "super"power richer and more connected to the countries it's been trying to subvert for fifteen years?
Anyways, Putin is, hopefully, not mad enough to step into nuclear territory. We'll see how he fares when he's cornered in (when Ukraine's counteroffensives get too serious to hide from the Russian public and he has to mobilise to hope to win, or back down.