I cannot see Russia leaving Ukraine happy without that:
Dnipropetrovsk Oblast
Donetsk Oblast
Kharkiv Oblast
Kherson Oblast
Luhansk Oblast
Mykolaiv Oblast
Odessa Oblast
Poltava Oblast
Sumy Oblast
Zaporizhzhia Oblast
Would have been better to say yes to Minsk. They will level.
I believe that you are wrong. Unless somehow Russia does actually possess the financial reserves and the industrial capability to continue to finance the war. Well, it does possess a vast treasure trove of natural resources and most countries in the world are still willing to trade with it... Maybe, it will substantially commit its economy on a war footing to produce the armaments, vehicles, etc necessary to sustain its efforts.
Another 30 to 50,000 troops entering the Donbass, along with the necessary complement of drones, missiles, long range artillery, close air support, and high altitude air strikes will enable it to undertake the manoeuvres to surround Ukrainian troops in the Donbass completely. They will be much more cautious in the manoeuvres and advances this time.
One of the great vulnerabilities of the Ukrainian military presently is that they are much more at risk to air assault than the Russians are. There is no way in Hell that the Ukrainians will be able to have a SEXTILLION LIGHT YEAR long convoy gathered and clustered for several weeks without being totally destroyed by Russian Airpower, unlike the Russians, who were easily able to nonchalantly do so North of Kiev. The Ukrainians cannot resupply large formation of their troops in already encircled places and also places not yet encircled but highly at risk of being so, such as in the least.
That convoy was a clear demonstration of decisive air domination by the Russians in Ukraine, as much as Western Media and analysts refuse to acknowledge it, and instead attribute it being stuck there mostly to logistical problems.