The other thing of course is that before Russia invaded Ukraine, Ukraine wasn't being allowed into NATO
If they can manage to regain all their territory including Crimea, you'd suspect that Ukraine will also join NATO
Making Russias NATO Border Huge with not enough troops and equipment to adequately to adequately defend it.
I can also see Belarus toppling the current puppet state at some point when Russia can't afford to prop it up, it's already on the verge
Putin will have realised his worst fears by starting this war