War drums not heard in half a century are beating across Europe. Nato Secretary General Mark Rutte has warned that Europe “must be prepared for the scale of war our grandparents and great grandparents endured”. British and French defence chiefs have urged their respective nations to be ready to lose children in the fight against Russia. Britain’s foreign intelligence agency MI6 warns of a “grey zone” between war and peace, citing threats from Moscow. Russian President Vladimir Putin accuses...