warning transatlantic ties were at risk. European countries including Denmark, of which Greenland is an autonomous territory, said they "stand united" against Trump's vow on Saturday to hit them with tariffs of up to 25 percent unless Greenland is ceded to the United States. "Tariff threats undermine transatlantic relations and risk a dangerous downward spiral," Britain, Denmark, Finland, France, Germany, the Netherlands, Norway and Sweden warned in a joint statement. Denmark's Foreign Minister Lars Lokke Rasmussen said Trump's ultimatum threatened the world order "as we know it" and the future of the NATO military alliance. NATO Secretary General Mark Rutte said he had spoken to Trump about "the security situation in Greenland and the Arctic" and hoped to talk again at this week's Davos summit. He did not elaborate on their conversation. The European Council said it was calling a summit of EU leaders in the coming days, following a meeting of EU ambassadors in Brussels on Sunday. (Bssnews)