From "The Analyst":

AVDIVKA BATTLE SAPS RUSSIAN RESERVES

The Ukrainians have managed for the most part to hold well in front of the areas on the east bank of the river that their new defence lines are being finished on the west of. In the northern part where the river touches Russian controlled land and they can try an come behind it, there have been tougher battles.
The area is geographically difficult for the Russians.
Several rivers flow east to west and fill the river that flows north to south - the same river the defence lines are behind.
These rivers force the Russians into corridors between them and make it difficult to manoeuvre, and they act as a funnel that forces the attackers into a tight targeting zone. As a result the Russians have held back. The northern sector however has appeared most productive for them, but the Ukrainians are having none of it. They keep up fire and counter attacks against the advancing Russians to such a degree that the Russians got bogged down. This was not acceptable to the Russian commanders who were afraid they were loosing the initiative. As a result they decided to do the one thing you only should do in two clear circumstances. They committed their reserves, half reconstituted units savaged in the Avdika attacks.
Reserves that are half reconstituted should only be used in a last ditch defence, or when you are totally sure they will tip the balance of a vital situation in your favour. This was neither, it was excessive pressure to maintain an illusory advance that was going nowhere for cosmetic reasons. That’s just bad generalship.
The consequences of doing this and what it tells us are significant. Firstly they have no other reserves. If they did they would use them. Some of the soldiers were captured and had only been mobilised 8 days prior!
It also tells us they have run out of men again and that building up reserves prior to a summer offensive isn’t going to be easy. Their quality will be minimal.
As it is some of the Russian advances were one way suicide missions. Troops were sent off to engage with zero back up in the full knowledge they weren’t coming back. Just to test minefields and detect the positions of Ukrainian defences.
Something tells me it’s going to be a difficult summer for the next Russian attempts to take more ground.

Slava Ukraini 🇺🇦!