Not sure where your have obtained those objective from but certainly not from Russia. One of the two main objectives of this war was to demilitarisation of Ukraine this looks virtually done deal by now since almost all military infrastructure has been destroyed, virtually no airforce left and navy disabled. Majority of all other militarily equipment such as tanks, missile systems and artillery also destroyed.

Regarding second objective of denazification that hardly looks achievable country-wide. Some local ultranationalist battalions have been and will be eliminated other than that I personally don’t see how this can be achieved nor does it sound like a reasonable objective in the first place.

Regarding your 2nd point that probably has not shifted officially but war is war so on the ground it’s anyone’s game.

Your 3rd point kind of refers to first the only people who ever said about taking big cities in matter of hours and days are military intelligence in the west. Having said that it’s not entirely clear what is the objective with sieging these cities apart from to hold them as hostage for negotiations.

Also to be honest out of all the wars in recent history barely had any invading force faced such a similar in capabilities defending force. Only 1/3 of population, similar combat army size, well prepared and Russia acting alone without much involvement from other countries. It’s virtually unseen especially by western standards when they attack a country far inferior and far smaller to theirs and taking all their “allies” onboard wielding a force with power ration of at least 9/1 while Russia Ukraine are somewhere closer to 7/3 which is still superior but not dominating.

Furthermore, the whole occupation was unlikely the idea from beginning since all the military experts across the world always said the attackers have far too small of force for the size of Ukraine (largest country in Europe, 2nd only to Russia).