The ECB and the competent authorities of Member States that are not participating Member States (‘non-participating Member States’) should conclude a memorandum of understanding describing in general terms how they will cooperate with one another in the performance of their supervisory tasks under Union law in relation to the financial institutions referred to in this Regulation. The memorandum of understanding could, inter alia, clarify the consultation relating to decisions of the ECB having effect on subsidiaries or branches established in the non-participating Member State whose parent undertaking is established in a participating Member State, and the cooperation in emergency situations, including early warning mechanisms in accordance with the procedures set out in relevant Union law. The memorandum should be reviewed on a regular basis.