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.

The US could be allowed to step up its military presence in Greenland, the prime minister of Denmark has 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.