It was a long, conspicuous sigh. On 13 February, on the stage of the Munich Security Conference, the US ambassador to the UN delivered a glowing tribute to Donald Trump, and at his side, the EU’s foreign policy chief grew impatient. Without taking her eyes off Mike Waltz, Kaja Kallas ostentatiously puffed out her cheeks, then exhaled slowly. The gesture went viral on social media, so perfectly did it capture European exasperation with the White House.