World leaders are heading for Germany, for the annual Munich Security Conference - one year since the US Vice-President JD Vance delivered a bombshell speech, lambasting European leaders and shaking the old transatlantic alliance. Since then, the Trump White House has tipped the world order upside down with punitive trade tariffs and an unpredictable approach to countries including Ukraine, Russia, Greenland, Canada, Iran and Venezuela. This year, the conference - which begins on Friday - once