Not sure if it counts, but one of my timelines involves Russian states never uniting into one great empire. So yeah, Russia remains more of a geographic term and politically, there are many "Russias". After a dictator seizes power in one of the more powerful principalities and starts what is basically a fascist regime, he decides to unite his country with his allies and then gradually conquer outlying territories to form the Russian Empire that never was. That's when he also starts using the title "Tsar", inspired by the Roman and Byzantine emperors and Bulgarian tsars of old. Due to the in-universe connotations with the regime, the word "tsar" takes on a radically different meaning, one akin to the OTL "Duce" or "Führer". Similarly, "tsarist" becomes the ATL equivalent of "fascist". As for the fates of the Russias ITTL : They never really unite completely, but they do form a roughly EU-like or NAFTA-like organization in the second half of the 20th century. And despite some of them having been taken over by dictatorships at some points in their modern history, the 20th century Russias are a lot better off than OTL Russia was at the same time. They are also notably more democratic.
Also, another one of my timelines has a stalemated RCW that balkanizes Russia into White and Red territories with "provisional governments" that last for decades. Including the title of "Supreme Ruler and Commander-in-Chief" among the Belogvardeyan (White Russian) forces - admiral Kolchak isn't the only holder of the title.

In a move reminescent of Horthy's "regency in the name of the Habsburgs" over interwar Hungary, this political post remains occupied well into the late 20th century. As for the Reds, due to early Soviet history turning completely different in the ATL