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 Kremlin has tried to calm tensions in a feud between Trump and Medvedev that spiraled into nuclear threats.

“Putin uses Medvedev as a tool to express statements related to nuclear weapons, he doesn’t want to discredit his own good peacekeeper’s name,” Lieutenant-General Ihor Romanenko, former deputy head of the General Staff of the Ukrainian Armed Forces, said ironically.