Neil Hauer has a slight Ukraine bias, but overall he's okay and he gets my respect for actually being on the ground in Ukraine rather than reporting from Twitter Oblast. Here's his take
My understanding is up to this point the Ukrainian government has reinforced the Donbas pocket with at least seven Territorial Defense Forces brigades. As we've seen so far these TDF formations lack the mechanization to allow them to be used for mobile warfare but for staying still and holding the line they're better than nothing (as long as you don't care about lost Ukrainian lives).
Don't know about the withdraw, but in the last 24 hours Russians counterattacked the Ukrainian Severodonetsk counterattack and took all the lost ground and more, including Mizhnarodnyy Aeroport to the south east. Basically the Severodonetsk counterattack has turned out to be feeding once again. On that note I asked someone who plays DotA exactly what "feeding" means and he explains during a game the team of five is meant to communicate and work together. When it's time to pounce on the other team the five players should work together and show up to the battlefield at exactly the same time, preferably from multiple directions. When the conditions are not right and not all five are in position the others already in position are meant to avoid the enemy team.
Feeding happens when one team is working in unison and the other team is not and their players show up one after another in piecemeal fashion. They are then easily defeated in a string of 5v1 engagement in a classed defeat in detail.
When this metaphor is applied to this war what it means is instead of accumulating NATO military aid until you've gathered a few full strength armour brigades at Lviv, the Ukrainian are sending the military aid they are receiving into critical sectors as soon as they receive them, in piecemeal fashion and with little training against Russians who have local numerical and fire superiority. It's little wonder then these western gear are making little impact on the battlefield.
On the other hand it was also pointed out to me that if Ukrainian do the smart thing and train up proper armour brigades in Lviv, sooner or later all that noise will reach Russians who would be like "nice brigade you have going on there, be a shame if a Kalibr or five fall on them".
On related note about military aid:
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EU is dry of Warsaw Pact ammo
Source for the claim that EU is out of SU standard ammo: