WASHINGTON (AP) — In a warning to Russia, President Donald Trump said Friday he’s ordering the repositioning of two U.S. nuclear submarines “based on the highly provocative statements” of the country’s former president, Dmitry Medvedev, who has raised the prospect of war online.

President Donald Trump issued a rare threat of nuclear escalation on Friday, saying he had ordered two nuclear submarines to be strategically positioned near Russia in response to what he said were aggressive remarks by Dmitry Medvedev, the country’s former president and current deputy chairman of its Security Council.

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.