US and UK government agencies are under threat from one of the most sophisticated hacking offensives in recent years, according to US and British sources. The hacking programme has been identified as originating from Russia.

However, the Russian foreign ministry made a statement that the allegations about Russia’s internet sabotage were “another unfounded attempt by the US media to blame Russia for cyberattacks against US agencies.”

The hack comes at a crucial time in US politics as Joe Biden is preparing to take office as the 46th president  but also comes at a sensitive turning point for Britain’s security and defence services as the UK negotiates its trade deal with the EU which is due to come into effect on January 1.