Did China's growing presence in Arctic prompt Donald Trump's offer to buy Greenland?

US President Donald Trump's eyebrow-raising idea to buy Greenland from Denmark last month epitomised what analysts say is Washington's fear of the growing interplay of Chinese money, Russian aggression and Arctic political division.

Of all the countries involved in the region, Denmark is feeling the most heat, and not just because Trump recently cancelled a trip and called its Prime Minister Mette Frederikse "nasty" for describing his plan to buy the world's largest island "absurd".

Over the past few years, both of Denmark's self-ruled governments " Greenland and the Faroe Islands " have increasingly turned to China for commercial deals, adding weight to Beijing's growing strategic influence in the vast area that forms the common backyard of Europe, North America and Russia.

Greenland is of particular concern to the White House and the Pentagon as it is home to the US Thule Air Force Base, located far above the polar circle and which served as the first line of defence during the cold war.

Nowadays, the island is also strategically important for the US ballistic missile early warning system, as the shortest route from Europe to North America goes via the ice-cloaked, resource-rich territory.

"Though it's difficult to tell the motivations of President Trump, he likely had China on his mind with his Greenland offer," said a Beijing-based diplomat, who asked not to be named.

The US was likely to step up its presence in Greenland in the future, the person said.

In May, US Secretary of State Mike Pompeo accused China and Russia of introducing a strategic power struggle into the Arctic region and described Beijing's behaviour there as aggressive.

When Greenland signalled an interest in engaging a Chinese state-owned company to build two airports in 2017 " the island's prime minister flew to Beijing to appeal for financial backing " Copenhagen stepped in amid US pressure, reluctantly agreeing to finance the projects from the public coffers.

Denmark's reluctance stems from a long-standing mistrust between Copenhagen and Greenland, as the island's quest for economic development is viewed by the Danes as an attempt to shore up capital to push for a future independence movement.

"There is no doubt that the US foreign and security policy community is becoming far more interested in Greenland as a strategic asset," said Andreas Boje Forsby, a researcher at the University of Copenhagen's Nordic Institute of Asian Studies.

"Proposing to buy Greenland could be interpreted as a very clear signal to both China and Denmark that Greenland is part of an exclusive American strategic zone," he said.