Whilst much has been written about the use of internet-based viruses as a cyberwarfare weapon to inflict damage on the infrastructure of other countries, one area that has not been examined concerns the manipulation of information to ferment disunity in other countries as an act of political subversion. Such a form of cyberwarfare poses particular challenges due to the difficulty of attributing such weaponisation of information. Furthermore, given that the weaponisation of information does not involve the use of military force, the target of such an action is faced with the difficulty of formulating an appropriate response. Russia’s use of its intelligence apparatus to hack the Democratic campaign in the US 2016 Presidential Elections reflected the weaponisation of information itself. Seeking to tilt the election in favour of Donald Trump, Russian weaponisation of information against the US took the form of a three-pronged strategy that had the effect of, firstly, sowing division within the Democratic Party; secondly, damaging the credibility of Hillary Clinton’s candidacy for President; and thirdly, arousing far-right sentiments to convince conservative voters in swing-states to support Trump’s Republican candidacy. This paper will conclude by examining how democracies may strengthen their political institutions against the application of cyberspace to undertake the weaponisation of information as an act of political subversion.