German security officials previously blamed Russia for hacking secret German communications and providing them to Wikileaks (English translation). And see this.
The claim? BBC reported:
"BfV [Germany’s intelligence agency] head Hans-Georg Maassen said Germany was a perennial target of a hacker gang known as Sofacy/APT 28 that some other experts also believe has close links with the Russian state. This group is believed by security experts to be affiliated with the Pawn Storm group that has been accused of targeting the CDU party...."
This is the same group blamed by the U.S. for the hack of the Democratic National Committee....
However, German officials now say that the communications were likely leaked from an insider within the German parliament, the Bundestag (English translation)....Washington's Blog
The Same Hackers Blamed for the DNC Email Hack Were Blamed for Hacking the German Parliament … But that Ended Up Being a Leak By German Insiders, Not a Hack At All