Enforced brevity focuses the mind wonderfully. And when the minds in question are two of the West’s most interesting historians of Russia, the result is a distillation of insight that’s vitally timely. Sir Rodric Braithwaite was Britain’s ambassador to Moscow from 1988-92 during the collapse of the USSR (where he was the boss of Christopher Steele, of Trump dossier fame), then chaired the UK’s Joint Intelligence Committee.