In my opinion, the Russian army in the south will keep heading west and take the major port of Odessa. Then Russia will control the entire northern coast of the Black Sea and thereby block Ukraine from receiving any resupply by ships. Effectively making Ukraine a landlocked country.
Ukraine is not getting resupply by ship now- Russia controls the Black Sea. They were getting some fuel maybe, but the bridge is blown now and that route is closed.
Mariupol was 400K population and it took 13K+ Russian forces 2 months to "sort-of" take Mariupol. against 1800 azovs and 3600 AFU marines.
Osdessa is one million. At the start of the invasion, Russia had (IIRC) 6 phibs in the Black Sea. One is on the bottom, one is torched, another has damage unknown.
That leaves the capability to land about 2,000 troops and maybe 80 tanks. IF the Russians were willing to risk the AShM's from Ukraine (which they are clearly not).
Those Russian forces freed up from Mariupol are not moving west, they are moving north towards Donestk along the H20. There isn't a lot of combat power there. And they are trying to hold back the Ukrainian counteroffensives around Kherson, with mixed results.
Odessa is off the table for the time being. There simply is not available Russian forces to make the try. All Putin can do is send more missiles into Odessa.
Also the Kerch Strait Bridge is a juicy target for Ukraine. If they can figure out a way to take out that bridge, it extends the southern LOC and makes resupply from Crimea a lot harder.
Putin will then annex the long thin strip of land between Moldova and Ukraine that's an independent region called Transnistria.
Most of the people in Transnistria are ethnic Russians and want to be part of Russia.
There are about 1500 Russian troops and about 8500 proxy militia in Transnistria. Reports have been that they are not interested in joining the war, I can't say.
There are some ammunition and weapons depots there that Ukraine would love to get their hands on.
I wrote some time back that I was waiting to see if Russia was going to get smart, and I'm finally seeing signs of that happening. They are no longer moving in long parades and "parking lot" formations, where they all pull into town with their barrels at 12 o'clock, and then stop for lunch or something while the AFU tears them to pieces.
In the north they are doing a "creeping advance"- basically pulverize the ground ahead with arty and then move forward slowly. This is effective if there is sufficient ammunition, and Russia appears to have sufficient ammunition. The formations are moving in parallel so they can offer some mutual support and protect each other's flanks.
It's safer, but slow. There isn't going to be any big victories by May 9.
The command and control is still very weak on the Russian side. When they do break through, by the time the word gets back to the CAA HQ the Ukrainians have already plugged the hole and pushed the attackers back. So there is no exploitation of the breaches when they do happen.
I don't know anyone who thinks Russia has the force strength to do an encirclement of the JFOA. Rule of thumb is 3:1, and Russia currently has 2:1, and no apparent way to increase that in the short term.