Why does Trump want Greenland, and what could it mean for Nato?

The US president's repeated demands to control Greenland could threaten the Nato military alliance.

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His demands have been rejected by the island's leaders and by Nato member Denmark, of which Greenland is a semi-autonomous territory.

Greenland - the world's largest island which is not a continent - is located in the Arctic.

It is also the most sparsely populated territory. About 56,000 people live there, mostly indigenous Inuit people.

About 80% of its territory is covered by ice, meaning most people live on the south-western coast around the capital, Nuuk.