Donald Trump has rowed back on his threat to slap tariffs on the UK and Nato allies who opposed his ambitions to annex Greenland, after he and the alliance’s chief “formed the framework of a future deal” for the Arctic region.The US president had earlier on Wednesday doubled down on his threats to secure the Arctic island, a self-governing territory of Nato ally Denmark, but ruled out the use of force to do so.He had threatened eight Nato countries, including the UK, with new 10% tariffs as a result of their opposition to his ambitions for the mineral-rich territory.