The sock order dates from last May, predating Trump's recent ambitions on Greenland, which is part of the kingdom of Denmark. The four-year contract is worth at least €4 million, but it could go reach €10.5 million, Finnish sock-maker Sukkamestarit said.

President Trump told Denmark’s leader he wanted to take over Greenland, European officials say. Denmark has asked its E.U. allies not to inflame the situation until Mr. Trump’s intentions are clearer.

Keir Starmer has been urged to back Denmark in its row with Donald Trump over the future of Greenland. The prime minister will hold talks with his Danish counterpart, Mette Frederiksen, in 10 Downing Street on Tuesday evening.