This is what happens when countries start sanctioning each other. The private companies like JPM, Goldman, etc. get caught in the middle of the politics, not that they're not already involved, but Russia's not going to sit still while the U.S. fucks them.
Russia will just hurt whatever entity they can, especially if it's American banks. These sanctions being levied on the particular parties are tantamount to undeclared war at the end of the day. Let's see if Jamie Dimon can get that half billion dollars back. LOL