The Guardian view on the EU and Trump: unity is strength | Editorial

The American president's sabre-rattling over Greenland should alert member states to the need for solidarity and a reset

European leaders, Sir Keir Starmer among them, will gather on Monday in Brussels to informally discuss defence and security issues five years after Britain left the EU. When the meeting was set last year, few expected US aggression toward a European nation to be on the agenda. But initial incredulity at Donald Trump's bellicose claims on Greenland, a Danish territory, has been followed by shocked expressions of solidarity with Denmark's prime minister, Mette Frederiksen. A bullying 45-minute phone call between Mr Trump and Ms Frederiksen was described as horrendous".

So it begins. As Europe reacquaints itself with MrTrump's aggressive America First" brand of diplomacy, further such provocations can be guaranteed. Fighting talk emanating from the White House will sometimes be a prelude to eventual compromise. But there can beno doubt that the challenges raised by the president's second coming aresubstantial and wide-ranging.

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