Russia's Rosneft aims to become the world's third largest gas producer and raise gas output to 100 billion cubic metres by 2020, the chief executive of the world's top listed oil producer by volume Igor Sechin wrote in an article published on Tuesday.

A massive cyberattack via a ransomware virus dubbed Petya has paralyzed dozens of businesses in Ukraine and neighboring Russian Federation, dpa cited state news agencies as reporting Tuesday.

A Moscow-based cyber security firm, Group-IB, said it appeared to be a coordinated attack simultaneously targeting victims in Russian Federation and Ukraine.

The company later added it has notified law enforcement officials in connection with the cyber intrusion.

Bailiffs also said Sistema can not receive any income from 31.76 percent of MTS, 90.47 percent of Bashkirian Power Grid company and any of its wholly-owned Medsi medical clinics chain.

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Russian oil major Rosneft said on Monday a court decision to "arrest" shares held by business conglomerate Sistema would guarantee the fair resolution of a legal dispute between the two companies.

One of the firms Group-IB said had been hit in Russia, Damco, which is Maersk's logistics company.

Bashkirian Power Grid has recommended a dividend for 2016 of 1.3 billion roubles.

"Whether hackers use spyware targeting bidding data of fields, malware infecting production control systems, or denial of service that blocks the flow of information through control systems, they are becoming increasingly sophisticated and, specifically alarming, launching coordinated attacks on the industry", the report said.

It was unclear how, or if, the attacks were related, but they spread simultaneously across Europe-with some early reports of affected companies in the US -on the heels of a global attack in May.