Additional capital buffers, including a capital conservation buffer, a countercyclical capital buffer to ensure that credit institutions accumulate, during periods of economic growth, a sufficient capital base to absorb losses in stressed periods, global and other systemic institution buffers, and other measures aimed at addressing systemic or macroprudential risk, are key prudential tools. In order to ensure full coordination, where national competent authorities or national designated authorities impose such measures, the ECB should be duly notified. Moreover, where necessary the ECB should be able to apply higher requirements and more stringent measures, subject to close coordination with national authorities. The provisions in this Regulation on measures aimed at addressing systemic or macroprudential risk are without prejudice to any coordination procedures provided for in other acts of Union law. National competent authorities or national designated authorities and the ECB shall act in respect of any coordination procedure provided for in such acts after having followed the procedures provided for in this Regulation.