The president’s announcement comes amid growing frustration with Moscow and his social media spat with a top Putin associate.

"I have ordered two Nuclear Submarines to be positioned in the appropriate regions, just in case these foolish and inflammatory statements are more than just that," Trump said. US President Donald Trump on Friday said he had ordered two nuclear submarines to be positioned in regions near Russia in response to threats from former Russian president Dmitry Medvedev.

The United States is moving two of its nuclear submarines to regions near Russia, US President Donald Trump said, following doomsday threats over the war in Ukraine from former Russian President Dmitry Medvedev.