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while reaffirming Copenhagen's sovereignty over it.   Before a signing ceremony at the UN General Assembly in New York, US President Donald Trump said "we will immediately begin the process of developing a large military presence in the appropriate locations". Danish PM Mette Frederiksen said the deal was "good for the US, Denmark and Greenland" and also for Europe and Nato, while Greenland's PM Jens-Frederik Nielsen said it was a "win-win-win". The three leaders then inked the deal, seemingly ending more than a year of tension over the Arctic territory. Trump had threatened to "take" the semi-autonomous Arctic territory over what he said were national security concerns, citing its strategic defence location and its mineral wealth. His rhetoric prompted outcry from Greenlanders, Danes and European leaders who issued a joint statement saying his words "undermine transatlantic relations and risk a dangerous downward spiral".      (Interactive or visual content)       The deal amends and updates a 1951 defence agreement between Denmark and the US. The new pact says the US "shall be allowed to establish an additional Defence Area at Narsarsuaq and Mestersvig" - referring to locations in Greenland's south and east. Narsarsuaq is a former civilian airport and World War Two base. It has deep-water access and a large runway which US military engineers were recently surveying, the US North Command confirmed to the BBC. The Mestersvig outpost is remote, far less developed, and used by a Danish naval dog sled unit. The "modalities and technical details" of the bases are yet to be confirmed, and according to the deal, must be mutually agreed by all parties,  This means the US security arrangements are not unfettered and Greenland and Denmark's approval is still needed. Washington currently operates its Pituffik Space Base in Greenland's north-west, and the new deal allows the US to "modernise and expand its activities" there.  It also says that "no state that is not a member of Nato shall be allowed to establish its own manned or unmanned military installations in Greenland nor shall they be allowed a persistent presence of military forces in Greenland". Although the militaries of non-Nato countries are now explicitly barred from the island, it was highly unlikely that non-allied troops would have been allowed access in the first place. Critically, no territory is ceded to the US, and it recognises both Denmark's  "sovereignty and territorial integrity" and Greenland's right to self-determination. On one hand, that's a significant climb down from Trump's earlier calls to acquire the Arctic island. But it does deliver a strengthened US military presence and expand on the previous agreement. Therefore to some American eyes, that will be perceived as a historic win. The new deal must still be approved by both Denmark's and Greenland's parliaments.      (A map showing the existing US military base in Pituffik in Greenland's north-west, and two planned bases in Narsarsuaq in the south, and Mestervig in the east.)         Despite months of crisis, the mood at Tuesday's signing ceremony appeared strikingly upbeat and friendly. "We going to have a tremendous relationship, a secure relationship," Trump said. "This is tremendous for Europe and for the United States, for everybody, and for Greenland it's going to be incredible." Meanwhile, Frederiksen described the signing of the deal as a "milestone in our long-standing co-operation".  "Seventy-five years ago we entered into an agreement about the defence of Greenland. Today, we're signing an even bigger and better agreement - a deal that can last forever." The Danish prime minister stressed that the agreement "respects sovereignty and territorial integrity of the Kingdom of Denmark, as well as Greenland's right to self-determination". Jens-Frederik Nielsen said that "for Greenland, it is not only an agreement about us, it is [an] agreement with us. "It takes into account the people of Greenland, our rights, our livelihoods and the development of our country. "Greenland matters for North American security and for transatlantic security," he said, adding that the Nato had a key role to play in the North Atlantic in a changing security situation. The agreement also confirmed Greenland would remain in Nato if it were to gain independence from Denmark. The 1951 agreement already allowed the US to send as many troops as it wanted to Greenland. Washington already has more than 100 military personnel permanently stationed at its Pituffik base. Trump had tried for months to purchase or annex Greenland, arguing that it was vulnerable to adversaries, including Russia and China. He argued the Arctic island was an essential piece of his plan to build a futuristic "Golden Dome" defence system to protect the US against missile attacks.  However the deal only mentions the project once, and contains no concrete proposal. A Nato spokesperson said shortly afterwards that the military alliance welcomed the deal, which would "help advance security, stability and cooperation in this vital region". In Denmark, the deal is being hailed as a triumph of diplomacy, and several political parties in Denmark have already said they would back it. For Greenland, a country of 56,000 people, there was good reason for a big sigh of relief. Its leader sat side-by-side with the world's most powerful man, and got a deal that should now bring an end to months of crisis.     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