President Donald Trump has ordered nuclear submarines to be positioned near Russia in response to escalating threats from Moscow. Amid growing tensions over the Ukraine war, Trump and Russia’s former president Dmitry Medvedev traded blows this week,

In a social media post, the president described the move as a deterrent prompted by threats by a former Russian leader. It is unclear if any submarines did actually change position.

President Donald Trump said he ordered two U.S. nuclear submarines to reposition to “the appropriate regions” following what he said were “highly provocative statements” from former Russian President Dmitry Medvedev.