Mette Frederiksen, the Danish prime minister, has accused the US of putting “unacceptable pressure” on Greenland – which she has vowed to resist – before an unsolicited visit to the Arctic island by members of the Trump administration. Later, just hours after her comments, the White House sprang a fresh surprise, as the US vice-president, JD Vance, announced he would join his wife on a trip to the territory this week. “There was so much excitement around Usha’s visit to Greenland this Friday that I decided that I didn’t want her to have all that fun by herself, and so