Russian hackers attacked the website of the Organization for Security and Cooperation in Europe this fall, the OSCE sources told Le Monde journalists.
According to the sources, the hackers could take the OSCE inside information, in particular, about the work of its mission in Ukraine.
Fifty seven OSCE member states were informed about the incident, but each of them had decided to conceal the information from the public.
According to Western intelligence, a group of Russian hackers APT28 is responsible for the cyber attack. This group is also suspected of involvement in hacking the server of the Democratic presidential candidate Hillary Clinton's Staff during the election campaign in the United States.
French journalists say that this group is known for its close links to the Russian security services.
As QHA reported earlier, Bulgarian President Rosen Asenov Plevneliev in November said that Russia using cyber attacks is trying to destabilize and divide Europe, as well as to influence the elections in the United States.