You'd need to back this up with some real evidence for it to be convincing.
As it stands right now the freezing of Russian reserves is in effect and international markets are essentially untouched, what are these additional sanctions you are referring to?
I am not an expert in this area but is seems to me that if Russia disappeared from the financial system, with an annual GDP of 1.4 trillion, nobody would really notice after the initial write-downs. It is one tenth of China, and has been chasing away FDI for over a decade - thus reducing its international impact. But I am open to explanations as to why this is a big deal, let me know!