Lol!
The pain point isnt U.S. banking...it is European energy imports. The EU cant shut off Russian banking because they have to pay Russia for their natural gas...or freeze this Winter.
Quoting from the TELEGRAPH article: "The Kremlin can in theory use gas as a diplomatic weapon but this would ravage Russia’s own economy. It would not achieve much at this time of the year in any case since Europe has built up large gas reserves.
The EU has huge spare capacity for imports of liquefied natural gas (LNG), and there is no longer an acute shortage of global LNG supplies. Several pipelines have been modified since 2009 so that gas can be funnelled both ways, reaching most EU areas. Both Poland and Lithuania will be opening new LNG terminals this year.
Even if Russian cut off gas to Europe, the West could meet its power needs by a variety of means. “If we have to, we can fire up a lot of idle coal-powered plants. It would take time, but only months,” said Professor Alan Riley, from City University.
“The real danger is that we hit Russia too hard and crash the whole Russian economy. Nobody wants to do that,” he said.
http://www.telegraph.co.uk/finance/economics/10981648/Russia-vastly-outgunned-in-economic-showdown-with-West.html