What are the big threats to our way of life? This question was a lurking preoccupation at the London Defence Conference this week, attended by the prime minister and the chief of defence staff along with academics and politicians from across the Western world. The immediate crisis is Ukraine, of course. There was general consensus that victory is essential not just for Ukraine but also for the continued security of its allies. In the margins of the conference George Robertson, former NATO secretary general and UK defence secretary, warned that the rules-based order will be over unless Russia's illegal and...