Schrödinger's Cat 1: The Universe Next Door

In The Universe Next Door, the President of Unistat is Furbish Lousewart V; in that universe, a terrorist organization known as Purity of Essence (named after General Ripper's obsession in the film Dr. Strangelove) threatens to detonate nuclear devices in major cities all over Unistat. Also mirroring Dr. Strangelove, Unistat has an automated device that will send nuclear missiles to Russia in the event of such an attack. Russia has a similar device to bomb China, and so on.