See item 7 of the European Commission’s Banking Communication 2013: “Financial  stability remains of central importance in the Commission's assessment of state aid to the financial sector under this Communication.” Art. (Artikel) 107(3)b. 8. BRRD, Art.
In short, the regulatory challenges raised by Islamic financial institutions are yet to be resolved in a comprehensive manner. Some regulatory authorities have already started looking into the appropriate regulatory framework. However, there is still quite a distance to travel before regulatory authorities  could come up with a standard and comprehensive set of regulatory prescriptions and supervisory norms for Islamic banking.