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.

Russia has abandoned a long-held nuclear "freeze" after Donald Trump deployed submarines near Vladimir Putin's coasts. Moscow has said it no longer considers itself bound by a self-imposed ban on the deployment of missiles - and is poised to bring short- and intermediate-range nuclear weapons into action.