Russia using support staff to replace frontline troops

 ISW:

...

Russia is reportedly increasingly deploying support personnel and auxiliary units to replace combat losses in Ukraine. The Ukrainian General Staff reported that Russia is deploying servicemen from military support units, including educational institutions, to replace combat losses.[1] Russian officer casualties and the decision to strip Russian training units of personnel will further impede the Russian military’s ability to train new conscripts and replacements. The Ukrainian General Staff reported that three battalion tactical groups (BTGs) including up to 2,000 Russian and South Ossetian personnel from Russia’s 4th and 7th Military Bases in South Ossetia and Abkhazia, respectively, deployed to unspecified locations in Ukraine.[2] Social media users observed South Ossetian forces in the Donbas region on March 29, but ISW cannot independently confirm if the entirety of these reinforcements were deployed to Donbas.[3]

The Ukrainian General Staff additionally stated that Russia faces continuing morale and supply issues, including contract servicemen (volunteer troops, not conscripts) in the 26th Tank Regiment requesting to terminate their contracts and relocate to garrison service, and elements of the 150th Motor Rifle Division receiving inoperable equipment from military storage.[4] The Ukrainian Main Intelligence Directorate additionally claimed that Russian military procurement is “on the verge of failure” due to western sanctions and that Russia cannot produce modern weapons and equipment without foreign electronics.[5] ISW cannot independently confirm these Ukrainian intelligence reports, but they are largely consistent with previously confirmed reports of low Russian morale and equipment failures.

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Elements of Russian forces around Kyiv, both in the northwest and around Brovary, continued to pull back into Belarus on March 30, though Russian forces continued to defend their front lines in the area and shell civilian targets.[6] Ukrainian Interior Ministry Advisor Denisenko reported on March 30 that Russia has not decreased its military activity near Kyiv and those ongoing Russian withdrawals appear to be unit rotations, rather than a cessation of hostilities.[7] Ukraine’s National Security and Defense Council concurred that Russian forces withdrawn from Kyiv will likely be redeployed to other axes.[8] The Ukrainian General Staff reported at noon local time on March 30 that it confirmed a column of Russian forces traveled north through Ivankiv toward the Chernobyl area, though ISW cannot confirm the unit identification or size of this reported withdrawal.[9] The Kyiv Oblast administration reported that Russian forces are concentrating on shelling Ukrainian fuel storage to disrupt Ukrainian logistics and create a humanitarian crisis.[10] Russian forces around Kyiv will continue to shell the city, and forces withdrawn into Belarus will likely be deployed to other lines of advance in the coming week.

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There is more.

While it is clear that Russia's original plan for the conquest of Ukraine failed it is now at a point of rearranging the chairs on the Titanic.   Time does not look like their friend in this endeavor.  

See, also:

Putin has reached a 'culminating point' in war with Ukraine, Russian forces have lost 'morale,' expert says 

Russia has lost an estimated 7,000 to 15,000 troops, according to one NATO official

And: 

Russian Troops Accidentally Shoot Down Their Own Aircraft, Sabotage Equipment, Refuse To Carry Out Orders: Report

And: 

The bitter harvest Putin will likely reap from Ukraine