I'm assuming you mean in the worst case (depending on your PoV) scenario where Russia breaks into pieces like the USSR did?War is often a disastrous failure of leadership, who should have agreed long-term plans instead.
And speaking of that, it would be good if a bunch of 'leaders' began looking at what RU might look like after the UKR war. They did this ahead of time for both Japan and Germany and both worked out, over the long run.
I suspect the only thought they will have put into this will be how to secure the nukes (or more likely how to help the Russians secure them) from terrorists etc.
Anything beyond that, such as the Marshall plan, only really works when you:
- Have secured unconditional surrender from the other side, and
- There remains a coherent government (which there may not be if it all goes pear shaped).