Under the deal - yet to be ratified - the UK would hand over the islands but keep the base under a 99-year lease, which could be extended by 40 years

U.S. President Donald Trump has said repeatedly that he wants to acquire Greenland, possibly by purchasing it from Denmark, despite the U.S. ally's repeated insistence that it is not for sale.

He threatened to impose tariffs on countries that opposed him, and in a combative speech at the World Economic Forum in Davos, Switzerland, he asserted that the U.S. would own the island, a territory ...