The world is being forced to choose guns over butter with ever greater vehemence. Ukraine’s attack on Russia’s strategic capacity, crippling about a third of its planes capable of carrying and delivering nuclear bombs, is fraught. Even if it does not provoke a nuclear response, Russia would escalate the war qualitatively in response. Ukraine’s European allies would supply it with ever more weapons.These weapons do not suddenly pop into the donors’ hands the way they do in computer games. The weapons have to be built, and paid for. Resources have to be directed towards making guns, rather than butter.