Russian oil and gas giant Rosneft said on Tuesday that it's' undergoing a powerful cyber attack.

"A powerful hacking attack has been carried out against the company's servers," Rosneft said on Twitter. It also said that it hopes the attack is not related to, "current legal proceedings," with  Russian conglomerate Sistema.

Rosneft said, "The cyber attack could lead to serious consequences, however, due to the fact that the company has switched to a reserve control system.....neither oil production nor preparation processes were stopped."