Regime change is a very broadly used phrase that can carry a range of meanings [more actually than I would grant it]Remember many in Western Political establishment talking on hurting Russian economy for Russian to move to get rid Putin. So their aim is not just simply detered Russia to finance war in Ukraine, but also regime changes.
That's too much order to be hope for an economic sanctions. Historically economic sanctions very rarely ever happen to push regime changes especially in authocratic regime. Most of the times it is only solidifies their hold in power. We can see in Cuba, Iran, North Korea, Syria, or Venezualla.
There is certainly no plan or expectation that Putin would be replaced by a liberal democratic government.
But we do have a situation here where a single man had led his country into a personal vandetta that is having severe adverse effects on his country.
He is surrounded, so we are told or is inferred to us (even I think by Feanor) by ruthless, greedy people who are not likely to tolerate failure or an erosion of their personal wealth or position. There is no 'party' to back him up, nor any religious institutions. So it is very different from most of the other countries you cite.
While Putin retains power, there is no way out of the quagmire they've got themselves into.
The practical question, given Feanor's statement that many of his likely replacements are equally as nationalistic and as ruthless as Putin, is whether they think the cost benefit of the present engagement is worth it. If they think it is, then nothing will change.
If they don't think it's worth it, then the only way out of the quagmire and for Russia to get itself back to where it was is for Putin to be replaced and, for want of a better phrase, for an apologetic withdrawal to occur; blaming Putin's [insert derogatory phrases here] for the whole mess.
I can see lots of issues even here. How much do they give up? The Eastern Oblasts they were previously destabilising? Perish the thought, even Crimera? Do they pay reparations? [I personally think the west would be foolish to insist on this and the world would be better off - and it would actually be in the west's interests - if an international fund was established to rebuild the country]
Again, taking Feanor's words at their face value, 'regime change' won't change anything longer term. Russia might well remain a paranoid, dangerous country. But the present crisis might pass and the world will be more aware of, and viglient about, the danger it poses.