I'm continually shocked at how many people believe that this is actually a bad thing.
What Russia did was violate the sovereignty of Ukraine, and sovereignty has been a core rule for almost 400 years.
Doesn't "Gee, Sorry you lost all your money, but you just didn't do your own research and understand the system and technology" sound familiar?
> The bulk of Russia’s foreign reserves are held in the form of securities, deposits at other central banks and deposits at foreign commercial banks. A ban on transactions with Russia’s central bank means that it can’t sell those securities or access those deposits