how come sanctions would affect something that should be done by iranian people/government...actually , banks have power and can shake economy like a tree t in hurricane and dealing with them need some sort of though action and if some one do this , other parties will just pop and screw government and Parliament for it and then banks will use every mean to crush the economy and sell country to others ( you mean who are " others " right !? ) ....
after all hundred billion dollars easy and pure profits is nothing that they just let it go ...
in last year ( jalali ) our economic growth was negative but all of our private banks have more than 60 percent pure profits and some others have more than 90 percent ( may God won't forgive Ahmadi Nejad for giving authority for founding private banks ) ....
and some funny thing is that as far as I know in all the world , governments have access to all people bank account information to monitor their financial activity and obtain taxes , but in Iran , banks don't let government to have these information and so government can't obtain taxes and control people for not doing illegal things ...
so , you can see final level of capitalism in Iran bank system , no tax , no law , no restriction and pure profit in every economical condition !!!!
Even india has the same problem ....with sanctions or without sanctions...
Most of the money in swiss banks is from indians...