The United Kingdom and the United States have accused Russian Federation of instigating a malicious cyber-attack, which affected "millions of machines", including those in hundreds Australian businesses.
It followed a series of warnings by Western governments that Moscow is behind a string of cyber attacks.
Ukraine attack: Washington and London blamed Moscow in February for a debilitating 2017 cyber attack against Ukraine called "NotPetya", which also damaged IT devices worldwide.
No comment from Russia: Moscow has not responded to the statement.
USA intelligence agencies previous year accused Russian Federation of interfering in the 2016 election with a hacking and propaganda campaign supporting Donald Trump's campaign for president.
As tensions remain high over Russia's involvement in Syria, its alleged tampering in the 2016 USA election and the poisoning of a former Russian spy, the United Kingdom and U.S. say that Russia will be held accountable for the cyber-attacks.
The UK and the USA issued a joint alert accusing Moscow of mounting a "malicious" internet offensive that appeared to be aimed at espionage, stealing intellectual property and laying the foundation for an attack on infrastructure, as reported by the Guardian. The statement did not identify any victims by name.
"We don't have full insight into the scope of the compromise", said U.S. Department of Homeland Security cyber security official Jeanette Manfra.
Shortly after the announcement, the White House said Joyce would leave his post and return to the U.S. National Security Agency.
Joyce further said that the meeting is not connected to Friday's raid over Syria.
US and British officials warned that infected routers could be used to launch future offensive cyber operations.
It is noted that according to the officials of the security sector, the British government communications Centre (GCHQ, the intelligence Agency responsible for protecting the public value and electronic intelligence - ed.) will "continue to expose the unacceptable behaviour of Russian Federation in cyberspace".