FollowingthecrisisinUkraineandRussia’sinvolvementinSyria,theworldisclosertosuperpowerconfrontationthanatanytimesincetheendoftheColdWar.NowacommitteeofseniorformerBritishmilitaryanddiplomaticfigurescomestogethertowargameahypothetical‘hotwar’inEasternEurope,includingtheunthinkable-nuclearconfrontation.TheWarRoomfacesa...