"Denmark's spy chief has been in prison for over a month for allegedly leaking classified information"

CNN:

Little detail is known about the case, including the nature of the alleged leaks.

DW:

In 2020, [public broadcaster] DR reported that [Denmark's Defense Intelligence Service] had shared raw information cable data with the NSA. As a result, it said, the NSA may have had access to Danish citizens' personal data and private communications.