What clouds the determination of whether the movement of russian troops from the black sea is a prelude to moving on to all of Ukraine a bit, is that they most likely will be unloaded on the part of the coast that is in separatist territory. In which case, he needs those troops there just to hold and secure the separatist regions. There is already a battle line there based on the previous years of war but two thirds of the regions are outside the russian held sections- but are nevertheless part of the territory that Putin just said is now independent. What to do? Enter, Russian troops.
Again, the point being that he has work to do there with those troops, even if, he does not plan or yet plan to take all of Ukraine. So it is definitely game on- ie Putin has taken part of Ukraine and intends to occupy it with russian troops- done/in progress. Not yet game on for taking all of Ukraine. Give it another hour. Little joke there. OR NOT.
Supply lines, fuel, food, local displeasure are all factors. Russia has a huge force and keeping it all sitting is a task onto itself.
To the point of intelligence sharing, US global hawks are sweeping Donbas right now with a lot of intensity.