So the news now, and the pretty clear message of the below-linked speech by Russian commanders, is that Russia is now claiming to be refocusing on the east and Donestsk - presumably as an attempted face-save and trying to scale back the war to something achievable. If it is indeed achievable for them, which we'll see, I guess.
https://eng.mil.ru/en/special_operation/news/more.htm?id=12414735@egNews
Yes, the problem is that Russian forces in Ukraine have already suffered serious casualties, and they don't have a strategic reserve ready to deploy. More than 10,000 dead is a lot when you had less than 200,000 troops to start with. Even if they can extract troops from the northern and southern fronts, they have a long way to travel to the new area of operations, and they are already tired and hungry and disillusioned with lost or broken kit.
In addition, there is a rule of thumb "never reinforce failure." The attack from the Donbass has failed, and the attack east of Kharkiv
hit its logistical limits a few weeks ago. Maaybe they can take Mariupol but that will take a lot of their remaining infantry.
I don't know if that video of police arresting a passer-by trying to give foreign reporters a pro-Putin statement at the Kremlin is authentic, but it would be a complete change in style for Putin to try to put the nation behind his war. And I don't know if that would help before the economy collapses from sanctions or the army collapses from sheer bloody ineptitude and lack of manpower to protect its supply lines and hold the areas it is operating in.
I still have not heard anything about proposals to vastly increase NATO munitions production starting yesterday, so there will probably be a "shell crisis" in the spring unless the Russian army collapses by the middle of April. Some people say the Russians are already running out of guided bombs and missiles.
Edit: and if we want a poem
here is one ...
On fut suld be all Scottis weire, // weire = Wehr, defense
By hyll and mosse themself to reare. // reare: roar? an earlier edition has weire “defend”
Lat woods for wallis be bow and speire,
That innymeis do them na deire.
In strait placis gar keep all store,
And byrnen ye planeland thaim before.
Thane sall thai pass away in haist
Wenn that thai find na thing but waist.
With wykes and waykings of the nyght // wyke: wake
And mekill noyis maid on hytht, // mekill: big, large
Thaime sall ye turnen with gret affrai, // affray: fright, alarm
As thai ware chassit with swerd away.
This is the counsall and intent
Of gud King Robert’s testiment.
That was how the Crimean Tartars defeated
the Russian invasions in 1687 and 1689. The Russians have been making the kind of mistakes which you don't need Clausewitz to recognize, you just need a King's Mirror and some folk poetry. "Don't surround yourself with flatterers who say only what they think you want to hear" is autocrat 101, "hope for the best but plan for the worst" is just as fundamental.