On Nov. 20, Copenhagen-based Andreas Steno Larsen and Stockholm-based Martin Enlund published a research note in which they also implied that governments had not learned lessons on human freedom from the trials of Nazis after World War Two.

The paper sparked debate on social media, leading Nordea to delete the research from its website and investigate how it came to be published in the first place.

"The conclusion of the review is that it contains statements and references that are not consistent with Nordea's code of conduct and values," the bank said in the statement.

Larson confirmed on Twitter that he had resigned. Enlund was not immediately available to comment.

Nordea said that the pair had the option to stay but had decided to leave the bank.

(Reporting by Essi Lehto; Editing by Kirsten Donovan)