Russian seems in their communique tell they are consistent with their aim. Thus the first stage is always securing Donbass and Crimea security
interfax.com
I put interfax this one, as it put Russian General Staff Rudskoi announcement. He put the first stage always been to secure Donbass, and the decision to widen theater is to in able Ukrainian ability for constant replenish forces in Donbas.
By his announcement, seems Russia will continue to force out Ukraine forces in Luhansk (almost complete), Donetsk (half way), and will going to attack Ukraine logistical line by missiles and air attack.
For me, seems Russia going to keep their gain not only in Donbas but also in Kherson and Zaporizhye Oblasts for Crimea security.
All other positions will be continue being hold for continue 'demilitarisation' by attacking and destroying Ukraine forces outside the major cities. However indication from Russian they will not move in to large cities like they do in Mariupol. Mariupol is different story seems, they need to hold it for Donbas security.
I say basically the other reason for Mariupol as they want to claim all shores of Azov sea. Afterall Russia think Azov sea is like their 'inland' sea. So I got a feeling those four Oblasts will be hold by them no matter what.
Seems after securing those four Oblasts, the rest of operation not to aim gaining more territory, but more to destroy what's left of Ukraine Army.
Add:
There's report that in Kherson, they already distributing Ruble for use on daily transaction. This's the thing that's being done in Donbas and Crimea. More sign Kherson Oblast and the adjacent Zaporizhye Oblast will be kept for Crimea security, land bridge to Donbas, and to kept all Azov sea shores.
Something they are not doing in other Ukrainian territory under their control so far.