The issue here is that Russian BTG’s (battalion task groups) rely heavily on a pre-established, internal insurgency. They had that for their earlier efforts in the Crimea and it shows. They insurgency was far warmer in the Donbas and there were substantial errors and operational slow-downs during the worse the fighting there. Since then the Ukrainians have improved their army but more importantly the Russians simply don’t have the insider support where they want to go. @Randy Daytona posted the great article about various strategic options and I wonder which the Russians might select?