The war of words between President Trump and Russia’s Dmitry Medvedev has escalated to a nuclear threat. -After Trump slammed Medvedev as a “failed former president” and warned he was “entering very dangerous territory,

“He’s entering very dangerous territory!” the U.S. president warned on social media.

Donald Trump has been threatened with nuclear weapons by Russia's former Prime Minister amid a bitter online feud. Dmitry Medvedev, also Russia's former President, had started the row by criticising Trump's threat to Putin that if he did not agree to a ceasefire in less than two weeks,