Will it work? We don't know. Sanctions does not have a good track record of being effective, but on the other hand such a massive package of sanctions have been tried before.
Of course the effect of any single sanction seem negligible. Does it stop the war to cancel a chess match? Of course not. Does it stop the war to seize some billionaires Yacht? Probably not. But the combined force of all the sanctions hopefully have an effect.
Some say that popular support does not matter because Putin is a dictator. However Putin himself clearly believe popular support is important, otherwise why the need for the massive propaganda and silencing dissenting voices?
When taking about the fairness of the sanctions, realize that a "fair and proportional response" according to international law would be to literally bomb and shell Russians cities.
A problem is, these things can also make him stronger? And increase pubic support.
If people start getting "bullied" because they happened to be born in Russia, then maybe some of them will start disliking Europe, and think "Putin not so bad after all".
What if you threw stones through someone's window, because they were born in Russia? Do you think that makes Putin weaker or stronger
Not saying I know what to do, or that I have the answers.
If I say, "this animal looks cute but it might bite", then, I'm not saying that all animals will bite you.
One sanction seems maybe-bad. But I'm not saying all sanctions are bad. On the contrary, most are good I think, eg SWIFT.
I want more sanctions: stop the gas.