Tension between the U.S. and Russia has escalated this week as Trump and Medvedev have exchanged harsh statements.

President Donald Trump said Friday he has ordered two nuclear submarines to be strategically positioned in response to what he said were aggressive remarks by Dmitry Medvedev, the former president of Russia and current deputy chairman of Russia’s Security Council.

P resident Donald Trump said on Friday he's ordered two nuclear submarines to move in the "appropriate regions" in response to what he called "highly provocative statements" from the deputy chair of Russia's security council, Dmitry Medvedev.