Thats because they know its doing an insane amount of damage to Russia both financially and military.
If this war was 3 days like Putin promised they would all be praising him. Instead they all got sanctioned and its hit their pockets.
As far as the military goes they also know just how incompetent they really are now, second biggest superpower status reduced to a laughing stock on the world stage.
How long will it take them to be a power on the world stage again? Rebuilding their army, replacing their huge armour and military losses, its going to take many many years
Ukraine aren't getting much done anytime soon though, they still have practically all the east to take back before they try and take Crimea, so while the last couple of days have been a distraction it hasn't changed much in Ukraines favour
This war still has a year or two to run, unless the coup attempt really has weakened Putin to the point he cant go on, even then the next guy still has to find a way out without losing face and that means keeping Crimea at the very least.
Ukraine could dig their heels in and say all or nothing, but that would then put pressure on the west to make him do a deal, we want out of this too.
So many ifs buts and maybes.