Aside from the territorial lines basically reaching a stalemate, Russia's ability to wage large scale war has been utterly crushed.

No one wants to get into a wider war, but they are in such a weak position now that even without the US, NATO would still completely shitrock them. The Russian Army is spent, the airforce is spent. They can do little more than lob missiles, drones, and launch ineffective ground assaults that have high casualties, and against a NATO army, would be wiped out to a man.

Russia is spent militarily, they are in an extremely weak position.