US vice-president JD Vance and US secretary of state Marco Rubio (centre) during a meeting with Ukraine’s President Volodymyr Zelensky on the sidelines of the Munich Security Conference on Friday. Photograph: Matthias Schrader/AP After 60 years of polite, annual transatlantic debate, the Trump administration has torn up the rule book of the Munich Security Conference. Munich rule number one, posted on the walls of the Bayerischer Hof hotel: “Engage and interact with each other, don’t lecture or ignore one another”. US vice-president JD Vance delighted in ignoring that rule on Friday with his claim that Europe is undermining democracy by...