London: Australia, the United States and the United Kingdom have blamed Vladimir Putin's military intelligence service for a cyber attack against Georgia, with Foreign Minister Marise Payne saying Russia must face consequences for its ongoing efforts to destabilise democracies.

Russian President Vladimir Putin. Credit:AP

The attacks on October 28 last year knocked out 15,000 government, media and private websites, and disrupted at least two national television broadcasts.

The websites were defaced and an image of former Georgian president Mikheil Saakashvili displayed.

Georgia, the US, UK and United States all released statements on Thursday naming Russia's military intelligence service, the GRU, as the culprit, with Britain's National Cyber Security Centre assessing that the GRU was a 95 per cent chance of being responsible.