“In a way, Trump is trying to play a game,” the director of International Security at the Royal United Services Institute (RUSI) Dr Neil Melvin said. Melvin suggested Trump was trying to call out Moscow for rattling the nuclear saber over the last three years.

Donald Trump has been accused of nuclear posturing, after claiming that he’d ordered two US submarines to move closer to Russia. The announcement followed an escalating social media spat with former Russian president Dmitry Medvedev,