US President Donald Trump said Friday he was ordering two US Navy nuclear submarines to “appropriate regions,” in response to remarks by Dmitry Medvedev, Russia’s former president and current deputy chairman of its Security Council.

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.

Russia’s far east nuclear submarine base appears to have been damaged by the tsunami that swept the country’s Pacific coast on Wednesday, according to satellite imagery obtained by The Telegraph.