IMO Russia's logistics have been improving over recent weeks rather than collapsing.
Hard to tell. Couple more weeks would be needed to convince me.
They had a dozen or two ammo depots that were/are critical links in their supply chain that now no longer exist. And if they replace/relocate them, chances are good they will be taken out there too.
If they can regroup, show some smarts and adaptability, well then, that will be a feather in their cap. Not one we have previously seen. If not, then that's gonna hurt. You have the tanks and the howitzrs and the rifle ammo being used out on the front lines. And the trucks running back and forth to the ammo depots to replenish. It is always helpful to not get to the ammo dempot and it looks like Hiroshima two miles before you even get there. And then ditto for the other ten in the area that otherwise would have been your backup.
We will find out soon enough. The Ukrainians are going to lean into them with the new western weapons for days to come. If Ivan is able to fire back, well then, he is and good for him. Ivan needs to watch his arse though.
The Ukrainians may use those long range missiles to take out the rail lines and bridges. That will ultimately give them some logistics head-aches, bigtime, if so.