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.

Medvedev currently serves as Deputy Chairman of the Security Council of the Russian Federation. Notably, he is now a trusted ally of Russian President Vladimir Putin.

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.