Okay. NK is now missing and the land is unclaimable. There's a Naglafar dreadnought from the Eve Online universe in orbit. This ship is effectively invulnerable to anything that present day nation states can throw at it.

Russia, for their own reasons, have been messing around despite warnings that aggression will not be tolerated

So, Russia's western cities have evaporated under the Nag's bombardment. This leaves one global superpower, the US. China wants to be a global superpower but is presently regional.

Ukraine's situation gets really interesting. Luhansk, Donestk and Crimea are suddenly undefended. Previously, UA couldn't muster a counter attack to retake those regions. Now, those regions are defended by unsupported and unsuppliable. Retaking them should be relatively brief.

Arms supply to African nations will dry up or shift to other countries. All the soviet/Russian arms suppliers don't exist anymore. Israel, China, US, UK, France and Germany (to name a few) will have plenty new customers to court (or snub).

And there's going to be a lot of new customers. Russia was a top grain exporter. worldstopexports.com/wheat-exports-country

Competition for food is going to be real high in net grain importers, mainly the Middle East. When people can't get get food, they get angry and riot. There are few things as primal as humans when they can't get bread.

Given the degree that NK was essentially self-contained, the effects are mostly regional and ecological. Russia, despite being unpopular, exported considerable amounts of resources: gas, oil, wheat, timber

The surviving cities and regions may be able to still generate those resources but the infrastructure to profit from them is gone. Governmental organizations and regulation is gone.

If Russia is destroyed in the fall, Germany and Europe won't have time to shift their gas supplies from Russia to anywhere else. We can see with the 2022 invasion that with 6 to 8 months warning, Germany can shift to other sources. But no one can make that change in a month.

Potentially, there's enough fallout from the bombardment that it might start a mini ice age.

Chinese leadership has a great reason to tell their people why they are giving up their Taiwan invasion plans. "We don't want to die" is an excellent reason.

Or they just stop talking about those ambitions.

Looking at the map of Belarus, Russia (former) and Ukraine... UA is gonna push/claim as far as they can around the Black Sea. Georgia will also try to push further north and west to meet up with UA.

I can't find the reference, but I saw a really fun and ineffective move by the UA parliament where they revoked a centuries old charter issued by proto-UA to found Moscow. While the claims themselves may never stick, that revocation points to extremely old histories of claims and counterclaims. Who owns Russian land after obliteration may come down to some treaty that no one but dusty history professors know about.

You could write a really interesting alt-history book on the Court cases to resolve all those old claims. So much courtroom drama!