It’s not often that Europe speaks with one voice – or responds with such urgency.

But US President Donald Trump’s announcement Saturday of sanctions against several European countries that reject any US claim to Greenland, a Danish territory, was one of those moments.

An emergency meeting of EU ambassadors will take place in Brussels on Sunday in response to Trump’s threat, which he made after an estimate quarter of the population of Greenland’s capital Nuuk joined protests against any potential annexation.