As regards the supervision of cross-border credit institutions active both inside and outside the euro area the ECB should cooperate closely with the competent authorities of non-participating Member States. As a competent authority the ECB should be subject to the related obligations to cooperate and exchange information under Union law and should participate fully in the colleges of supervisors. In addition, since the exercise of supervisory tasks by a Union institution brings about clear benefits in terms of financial stability and sustainable market integration, Member States whose currency is not the euro should therefore also have the possibility to participate in the SSM. However, it is a necessary pre-condition for an effective exercise of supervisory tasks, that supervisory decisions are implemented fully and without delay. Member States wishing to participate in the SSM should therefore undertake to ensure that their national competent authorities will abide by and adopt any measure in relation to credit institutions requested by the ECB. The ECB should be able to establish a close cooperation with the competent authorities of a Member State whose currency is not the euro. It should be obliged to establish the cooperation where the conditions set out in this Regulation are met.