"We categorically reject such accusations and we consider them to be unsubstantiated and groundless," Xinhua cited the Russian media quoting Kremlin spokesman Dmitry Peskov as saying.

"This is nothing more than a continuation of the Russophobic campaign, based on no evidence," he added.

In a statement on Thursday, British Foreign Office Minister Lord Ahmad attributed the NotPetya cyber attack to the Russian government and the Kremlin, saying Britain and its allies would not tolerate "malicious cyber activity."

The attack of a malware dubbed "NotPetya" disrupted numerous computer systems last year. It erupted first in Ukraine but the virus later spread to many other countries, including Russia.