Once hailed as a modernising reformer, Dmitry Medvedev, Russia’s former president and current deputy head of the Security Council, has reemerged as one of the Kremlin’s most provocative voices, escalating tensions with the West through increasingly aggressive statements. This week, Medvedev’s threats prompted US President Donald Trump to take a dramatic step: repositioning two US nuclear submarines to unspecified regions. “Based on the highly provocative statements,” Trump said on Friday, according to The Moscow Times, “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...