Denmark's Prime Minister Mette Frederiksen said on Sunday, "Europe won't be blackmailed," after US President Donald Trump threatened tariffs on eight NATO allies. Trump plans to tax goods from Denmark, Finland, France, Germany, the Netherlands, Norway, Sweden, and the UK starting February if they oppose his plan to buy Greenland. Trump called Greenland vital for US security and has hinted at taking it by force. The threatened countries issued a strong joint statement calling Trump's plans a "dangerous downward spiral." They emphasized, "Tariff threats undermine transatlantic relations" and showed full support for Denmark and Greenland. The nations, members of NATO, said they are ready to talk based on respect for sovereignty and territorial integrity. Frederiksen added on Facebook, "We want to cooperate and we are not the ones seeking conflict. And I am happy for the consistent messages from the rest of the continent: Europe will not be blackmailed." The US plans to start with a 10% tariff on goods and could raise it to 25% until a deal is reached. Trump wrote these countries "have put a level of risk in play that is not tenable or sustainable" and called the situation "very dangerous for the Safety, Security and Survival of our Planet." US Treasury Secretary Scott Bessent told NBC: "Greenland can only be defended if it is part of the US, and it will not need to be defended if it is part of the US." However, most Greenlanders oppose joining the US. A recent poll showed just 17% of Americans support the US buying Greenland. French President Emmanuel Macron said he would ask the EU to activate an "anti-coercion instrument" if tariffs are imposed. NATO and Arctic security are also major concerns. Canadian PM Mark Carney said Canada will increase Arctic security and stressed cooperation within NATO. NATO Chief Mark Rutte confirmed talks with Trump on Arctic security are ongoing. Public protests against Trump's Greenland plan took place in Greenland's capital Nuuk and in Danish cities. A US Congress delegation visiting Copenhagen faced criticism, with Democratic Senator Chris Coons calling Trump's rhetoric "not constructive." The tension continues ahead of the World Economic Forum in Davos, where Trump and European leaders are expected to discuss these issues.