Senator Mark Warner is the vice-chairman of the Senate Intelligence Committee, which is trying to explore the possibility of Russian collusion with the Trump campaign while avoiding a partisan blowup. Warner fears that that, with Russia, we’re confronting twenty-first-century threats with twentieth-century tools. And Simon Parkin, who writes about gaming for The New Yorker, reports on how military officers and diplomats predict world events using a game that’s something like a cross between Dungeons Dragons, Risk, and a rap battle.