Former Russian president Dmitry Medvedev has become embroiled in a tense back-and-forth on social media that prompted U.S. President Donald Trump to announce he had ordered the re-positioning of two U.

F ormer Russian president Dmitry Medvedev, who is currently serving as deputy chair of the security council of the Russian Federation, is embroiled in a social media spat with United States President Donald Trump, prompting the latter to order the deployment of two nuclear submarines.

Once seen as a modernising force, Dmitry Medvedev has transformed into one of the Kremlin’s most aggressive voices, now at the centre of a rare public clash with Donald Trump.