US and UK blame Russia for 'malicious' cyber-offensive

Security officials issue alert directly blaming Kremlin for attack as US warns Moscow it is 'pushing back hard'

The cyberwar between the west and Russia has escalated after the UK and the US 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.

Senior security officials in the US and UK held a rare joint conference call to directly blame the Kremlin for targeting government institutions, private sector organisations and infrastructure, and internet providers supporting these sectors.