Rosneft Deutschland, the German subsidiary of Russian state oil giant Rosneft, reported over the weekend a hack on its systems, German newspaper Die Welt reported on Sunday, quoting Germany's information security watchdog Bundesamt für Sicherheit in der Informationstechnik (BSI). Rosneft Deutschland reported a cyberattack incident on Saturday night, BSI told Die Welt. The German unit of the Russian oil giant is obliged—alongside other companies operating so-called critical infrastructure—to report such incidents to the cyber security…