"The structural systemic risks are so high in Finland's financial system that it is justified to impose a systemic risk buffer on all credit institutions," said Marja Nykanen, chairwoman of the Finnish Supervisory Authority.

The additional buffer, which will take effect from July 2019, will be 3 percent for Nordea, 2 percent for Op Group, 1.5 percent on Municipality Finance Plc and 1 percent on other Finnish credit institutions.

(Reporting by Stine Jacobsen; Editing by Simon Johnson)