President-elect Donald Trump is once again talking about the US buying Greenland, the world’s biggest island and a self-ruling territory of Denmark.

Trump first put forward the idea in 2019, during his first term as president. Both then and now, the response from the other side of the imagined transaction has been a resounding “no.” Undeterred, he’s now threatening to impose trade tariffs “at a very high level” on Denmark if it doesn’t relent.