The largest amount off Ukraine soldiers (around 60k before the war) are concentrated in the eastern front, there is fear that they can be cut off from supplies after Russians have taken control of Izyum

The General Staff actually proposed to the OP to withdraw troops to the second line of defense,due to the high probability of encirclement of the eastern front.Such a scenario was discarded as this would strengthen Russia's position in the info war.

The first line of defense has 6000 bunkers, connected with trenches. Protected with fencing, mine fields, and bunker protected heavy weapons

Russian troops have taken control of a command post of the Ukrainian Armed Forces Nikolaevka on Kiev outskirts. 61 Ukrainian troops of the command post voluntarily surrendered, more than half of them senior officers of the Ukrainian Armed Forces

https://twitter.com/YSoSerious_i_/status/1507712822473420803

Secret documents seized by Russian servicemen from the 4th Brigade of the National Guard of Ukraine

The secret order of Colonel General Balan, commander of the National Guard of Ukraine, dated January 22, 2022, has been published.

https://twitter.com/VIX38083085/status/1507717698880520196

>>15948106

Soldiers from South Ossetia will arrive in #Ukraine to fight on the side of #Russia

This was announced by the "president" of the occupied region of #Georgia Anatoly Bibilov.