If we turn St Petersburg into rubble, I doubt anyone will be worrying about a few trifling conventional weapons. NATO and Russia go at it, and we're all just sitting around next month waiting for the Chinese, Brazilians, Indians and South Africans to sort out who is responsible for which relief efforts.
Actually, now I think about it, that quad will probably be far more concerned with determining the disposition of the remaining NATO/Russian warheads. So even relief efforts might be impacted by their more pressing concerns.
In any case, the world would just be a mess for a good long while.
All that said, you are absolutely right about "spoils". No one is gonna be thinking about "spoils". Probably top of everyone's list of questions will be, "How many warheads are left? And what remnants of NATO or Russia control them?"
We're talking about two groups who would have conclusively shown they are perfectly willing to use their nuclear arsenals to achieve their goals. That, combined with the fact that their goals would become a whole lot less lofty overnight makes me think the world would become a very precarious place.
for that matter they're not going to be able to supply much relief effort, either. hopefully they'll pick a side - India or China - and ride out the eventual hegemonic war between those 2.
2.) https://en.wikipedia.org/wiki/Shoal_Bay_Receiving_Station - Brrzzt!
3.) https://en.wikipedia.org/wiki/Australian_Defence_Satellite_C... - Sparkle!
One of the places that sends the "shoot 'em up boys* signal to the stealth nuclear subs.
I'd thought these days the signal would be "OK Boomer"?
(I'm still impressed that the РВСН has St Barbara as a patron saint. They claim that it's because they were founded on her day, 17.12.59, but I'd bet it has rather more to do with towers and lightning strikes as attributes, as well as her existing patronage over artillerymen, tunnellers, and explosives workers in general. They make severe waffle irons in Chelyabinsk: https://lh3.googleusercontent.com/proxy/OUQPxihQfQDuPE-8f8X1... )