You are delusional to think that sanctions can help fight Russia.
Sanctions have worked to an extent, but I don't believe sanctions can make Russia stop the war. This looks like a war in that the ego plays a very big role. Neither Russia nor Ukraine nor NATO would want to agree that they've been defeated. Without the sanctions, Russia would have been able to do more harm to its enemies through economic means and otherwise. At this point, they're just looking for ways to survive whatever sanction that gets thrown at them and they've been managing well so far.
Even if ruble will go to zero, Russia would still continue producing tanks and rockets and paying their military.
The ruble can't go to zero but I get your point. If the ruble goes to zero that would mean inflation will be at about 200% and no country can fight a war and win with that kind of inflation. The price of everything would be so expensive that they would be forced to turn their focus on the economy instead of war.
Well, the ultimate goal of sanctions is to make people's life uncomfortable enough to force them to choose another leader/government. I can't remind of any such event happening in the past. Cuba is living under sanctions since 1960s but no effect on nation's political course whatsoever. Venezuela? North Korea? Iran? Nope. So, sanctions are ineffective. In fact, they are doing more bad than good for the EU and US. Finally, as you have mentioned, they are definitely not going to stop the war. Therefore, sanctions should be cancelled ASAP to prevent further harm to Western economies.
Regarding the ruble, it was an exaggeration, but what I can tell you is that what works for other countries won't work for Russia. Russians are special in way, they can withstand much harsher conditions than many other nations. I know many Russians and my ex-wife is Russian too so I know what I'm talking about...
