US President Donald Trump has said that US nuclear submarines are near Russian territory after earlier saying he would make this move in response to threats from former Russian president Dmitry Medvedev.

"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.