No, there is no fantasy universe where Russia just turns around and stops when they are winning the war. Ukrainians do not want to be sacrificed for foreign profits, and are deserting in huge numbers (see the subject of this post). The far-right nationalist movements in ex-soviet states are temporary, in the long run there will be a return to socialism. There was no "Russian rule" in the USSR.

I really doubt 10,000 NATO troops would make any tangible difference besides escalation from Russia's side. The troops from the DPRK were largely sent to honor the defense agreement and to get troop training in Kursk, which was successful for the DPRK.