Medvedev vs Trump: Russia’s ex-president becomes Putin's provocateur-in-chief

Dmitri Medvedev, the former Russian president who is today best known as a Kremlin provocateur on social media, managed to goad US President Donald Trump into redeploying two US nuclear submarines on Friday. Once the face of Russian openness to the West, Medvedev now promotes an ultra-nationalist agenda to his millions of online followers.