Trump also rebuked Medvedev in July, accusing him of throwing around the "N (nuclear) word" after the Russian official criticised U.S. strikes on Iran and said "a number of countries" were ready to supply Iran with nuclear warheads.

President Donald Trump has ordered the repositioning of two U.S. nuclear submarines. Friday's decision comes after what he calls "highly provocative statements" by former Russian President Dmitry Medvedev.

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,