My understanding is that there are various clearing houses that manage the balance sheets between banks, and those clearing houses are in turn accountable to the central bank of their respective countries.
Thanks Jonald, that's my understanding too. But I don't have a good handle on exactly who those clearing houses are or how they operate (I thought the big clearing house was SWIFT but I really don't know). So I guess if the US knows that Putin has say $2 billion in Bank X, then with sufficient influence they could tell the clearing houses not to "clear" certain funds, or cut off Bank X completely. Why not?
Yeah it's funny how "no one" really knows how it all works. Even the people at the local bank branch who work for the bank don't know. I'm sure it could be easily researched with all the info that's online today, but isn't it funny how uneducated we are about the global banking system that we all have historically put our trust in ?