Ciaran Martin, the chief executive of the National Cyber Security Centre, a part of GCHQ, said the United Kingdom is facing "two significant groups of threats in cyberspace": hostile states and rampant criminality.
Russian cyberoperatives have attacked Britain's media as well as its telecommunications and energy sectors over the past year, according to prepared remarks by the head of the government's main cyberdefense agency.
Russian hackers attacked British media, telecoms and energy companies over the a year ago, the head of the UK's National Cyber Security Centre has confirmed for the first time.
The NCSC, which is a branch of GCHQ charged with oversight of Britain's cybersecurity, was "actively engaging with worldwide partners, industry and civil society" to counter the threat, he said.
"Russia is seeking to undermine the worldwide system". That much is clear.
Ciaran Martin's stark warning comes after Prime Minister Theresa May on Monday said Russian Federation was "weaponizing information" and meddling in elections to undermine the worldwide order.
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The agency was "actively engaging with global partners, industry and civil society" to tackle the threat from Russian Federation, he said. And you will not succeed.
An investigation by the Guardian revealed that more than 400 accounts from a list of 2,700, all named by Twitter as being run by a notorious Russian "troll agency", had tweeted about Brexit in the run-up to and aftermath of the referendum.
The UK's energy, telecoms and media sectors have been targeted by Russian hackers.
It's now known that one particular account secured significant coverage in the mainstream press following the Westminster attack in March.
"NCSC believes that due to the use of widespread targeting by the attacker, a number of industrial control system engineering and services organisations are likely to have been compromised".