The men are suspected of leaking information about Säpo and the Swedish Defense Forces for up to ten years, says SVT.
In Sweden, two men have been charged with aggravated espionage.
The brothers are suspected of sharing top-secret intelligence from, among others, the Swedish Security Police Säpo and the Swedish Defense Forces to the Russian military intelligence GRU.
The prosecutors have informed about the matter today in Sweden and it was reported by several Swedish media. The men have been detained for a year.
Swedish of the public broadcasting company SVT (you switch to another service) according to the data leak is suspected to have continued for up to 10 years.
One of the brothers has worked at Säpo and the Swedish Defense Forces, among others.
Aftonbladet (you switch to another service) according to one of the brothers has worked in Säpo.