She added that “We remain very alert about this.”

NATO’s chief Jens Stoltenberg has also warned Russia to stop ‘reckless’ cyberattacks, backing the British and Dutch governments.

“NATO allies stand in solidarity with the decision by the Dutch and British governments to call out Russia on its blatant attempts to undermine international law and institutions,” Mr Stoltenberg said in a statement issued on Thursday during a meeting of NATO defence ministers

“Russia must stop its reckless pattern of behavior, including the use of force against its neighbors, attempted interference in election processes, and widespread disinformation campaigns.”

The 29 allies are discussing cybersecurity at talks in Brussels, with the US, Britain, Denmark and the Netherlands due to announce that they will provide offensive cyber-capabilities for use by NATO.

Russian Foreign Ministry spokeswoman Maria Zakharova on Thursday dismissed the new accusations as “big fantasies”.

Britain’s National Cyber Security Centre cited four new attacks associated with the GRU targeting the World Anti-Doping agency, Ukrainian transport systems, the 2016 US presidential race and others.

British officials earlier blamed the GRU for the March nerve agent attack on former Russian spy Sergei Skripal and his daughter Yulia in the English city of Salisbury.

Yulia Skripal, the daughter of an ex-Russian spy poisoned in England.

Yulia Skripal, the daughter of an ex-Russian spy poisoned in England.

Photo: AP

The British Defence Minister said Russia’s actions were those of a “pariah state” and that Britain and its NATO allies will expose such activities in the future.

“Where Russia acts in an indiscriminate and reckless way, where they have done in terms of these cyberattacks, we will be exposing them,” Gavin Williamson said on Thursday.

“This is not the actions of a great power. This is the actions of a pariah state.”

Earlier, Australian Prime Minister Scott Morrison and Foreign Minister Marise Payne issued a joint statement that Australian intelligence agencies agreed that GRU “is responsible for this pattern of malicious cyber activity”.

They said Australia wasn’t significantly affected, but the cyberattacks caused economic damage and disrupted civilian infrastructure in other places.

Britain’s National Cyber Security Center says four new attacks are associated with GRU as well as earlier cyberattacks.