Starmer Warns Trump Against Greenland Tariffs. UK prime minister Keir Starmer tells Donald Trump it is “wrong” to impose tariffs on allies opposing a US takeover of Greenland, during a phone call on Sunday. Downing Street says the conversation marks the first direct contact since the US president threatens a 10 percent levy on imports from eight European countries including the UK, unless a deal is reached over purchasing the island. The White House intensifies pressure over the autonomous Danish territory, citing national security concerns, prompting alarm across Europe and among Greenland’s population. Starmer reiterates that Greenland’s future must be decided by its own people and Denmark, stressing that Arctic security is a shared NATO priority. European leaders issue a joint warning that the tariff threat undermines transatlantic relations and risks a dangerous escalation.