Progression so far:
Current sitrep, according to a pro-UKR source:
How tenable is this position for UKR?
The primary ground lines of communication to the Eastern Formations coming from the West stop at the river. After that point, the supply line would become sporadic. Bridges are easy targets and the RuAF would be running interdiction. Seems like Russia was planning on keeping those Eastern formations pinned down, while they went for objectives all around them.
We see a lot of Green formations on this map, in the East and around Kiev, but how combat effective are they? We don't have the damage assessment reports to actually measure this. How effective were Russian mass-fires, especially the MLRS barrages? How effective have Russia's gunships been at reducing those formations? And the effect of RuAF ground attacks etc. etc.? All of these are still open questions that we probably won't know the answers to until proper analysis comes out on open-sources after the conflict is over.
Zelinski is again hinting that he is willing to accept Russian demands. This might be because those UKR units are not very combat effective at this point and/or their supply is critically low. In which case, his only alternative is to go full-guerilla-mode, but if they do that, it's gonna be Mariupol-level destruction everywhere.
The weather over Ukraine this week is bad. So probably no major movements this week. More time for negotiations.