Sir Keir Starmer could send British troops to Greenland as part of a NATO mission to help guard the Arctic for Donald Trump, it has emerged.

The Prime Minister is said to share the US President's view that action must be taken to deter Russia's threat in the polar region.

Mr Trump has recently ramped up warnings he could seize Greenland for security reasons, and has not ruled out using American military force to do so.

But, in a phone call with the US President on Wednesday evening, Sir Keir told Mr Trump the future of the island should only be a matter for Greenlanders and Denmark.

The conversation was followed by a flurry of diplomatic activity, with the PM going on to hold calls with Danish PM Mette Frederiksen and NATO boss Mark Rutte.

Sir Keir held a further call with Mr Trump on Thursday, before speaking with German Chancellor Friedrich Merz and French President Emmanuel Macron on Friday.

Downing Street said the leaders discussed how NATO needed to 'step up' in the High North, which includes Greenland, to deter Russia.

According to The Telegraph, military chiefs are now drawing up plans for a possible NATO mission on the island - an autonomous territory of NATO member Denmark.

Danish military forces are pictured participating in an exercise with hundreds of troops from several European NATO members in Kangerlussuaq, Greenland, in September last year

Donald Trump has recently ramped up warnings he could seize Greenland for security reasons, and has not ruled out using American military force to do so

Sir Keir Starmer is said to share the US President's view that action must be taken to deter Russia's threat in the polar region

British officials are said to have met with counterparts from countries including Germany and France in recent days to start the preparations.

A Government source told the newspaper: 'We share President Trump's view – Russia's growing aggression in the High North must be deterred, and Euro-Atlantic security strengthened.

'NATO discussions on reinforcing security in the region continue, and we would never get ahead of those.

'But the UK is working with NATO allies to drive efforts to bolster Arctic deterrence and defence.

'The UK will continue to work with allies – as we always have – on operations in our national interest, protecting people back at home.'