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U.S. President Donald Trump has increased pressure on European allies ahead of the World Economic Forum in Davos by renewing his demand for U.S. control over Greenland and publicly revealing private diplomatic exchanges with European leaders.

The move has unsettled allies across Europe, raised questions about diplomatic norms, and injected new tension into transatlantic relations at a moment of heightened geopolitical uncertainty.

In a series of social media posts over several days, Trump sharply criticized the United Kingdom and France, released private text messages exchanged with European leaders, and reiterated his willingness to use economic coercion and potentially force to secure Greenland, a semi-autonomous territory of NATO ally Denmark.

Trump has doubled down on his long-standing argument that Greenland is essential to U.S. national and global security. In multiple posts, he insisted that Denmark is incapable of defending the vast Arctic island from China and Russia and questioned the legitimacy of Danish sovereignty over the territory.

“The World is not secure unless we have Complete and Total Control of Greenland,” Trump wrote in a message sent to Norwegian Prime Minister Jonas Gahr Store and later made public.

U.S. President Trump has pledged to tell European leaders in Davos that the United States “will have to have” Greenland. He has also vowed to impose sweeping tariffs on countries opposing his demand, framing the issue as a test of strength rather than diplomacy.

🇺🇸 pic.twitter.com/sh3OdkR5pz

— The White House (@WhiteHouse) January 20, 2026

UK Criticized Over Chagos Islands Decision

In an unexpected escalation, Trump linked his Greenland campaign to the United Kingdom’s recent decision to transfer sovereignty of the Chagos Islands to Mauritius. The Indian Ocean archipelago hosts Diego Garcia, a strategically critical joint UK-U.S. military base.

Trump accused the UK of “GREAT STUPIDITY” for what he described as an “act of total weakness,” arguing that the decision would embolden adversaries such as China and Russia. He claimed the move reinforced the need for Washington to assert control over strategically vital territories like Greenland.

“These are International Powers who only recognize STRENGTH,” Trump wrote, adding that the UK’s decision was “another in a very long line of National Security reasons why Greenland has to be acquired.”

The UK government responded by stating that court rulings had undermined its position and threatened the long-term operation of the Diego Garcia base, leaving London with little choice but to reach a bilateral agreement with Mauritius. The treaty has yet to be ratified by the UK Parliament.

Trump’s criticism has resonated with some British opponents of the transfer and segments of the Chagossian diaspora, even as it strained ties between Washington and London.

Tariff Threats Against European Allies

Ahead of Davos, Trump announced plans to impose additional tariffs on eight European countries: Denmark, Norway, Sweden, France, Germany, the United Kingdom, the Netherlands, and Finland, explicitly linking the measures to opposition over Greenland.

He said the United States would levy a 10% tariff on “any and all goods” from the UK starting 1 February, rising to 25% from 1 June, unless a deal is reached for Washington to purchase Greenland from Denmark. Identical measures would apply to the other targeted European states, all of which are NATO members.

Asked whether he would follow through, Trump said, “I will, 100%.” When questioned about the potential use of force to seize Greenland, he replied: “No comment.”

European leaders have publicly rejected the pressure campaign. Denmark’s foreign minister stated that sovereignty over Greenland cannot be decided through threats, while the UK reiterated that the future of the territory rests with Greenlanders and Denmark alone.

Private Diplomacy Made Public

Trump’s decision to publish private text messages exchanged with allied leaders breached long-standing diplomatic protocols and unsettled several European governments.

One message, released by Norway following a freedom of information request, showed Trump responding angrily to an appeal from Prime Minister Støre and Finnish Prime Minister Alexander Stubb to de-escalate tensions.

“Considering your Country decided not to give me the Nobel Peace Prize for having stopped 8 Wars PLUS, I no longer feel an obligation to think purely of Peace,” Trump wrote, directly tying his Greenland stance to personal grievances.

Another message, posted by Trump himself, revealed French President Emmanuel Macron’s more conciliatory private tone. Beginning with “My friend,” Macron acknowledged alignment with Trump on Syria and Iran before stating, “I do not understand what you are doing on Greenland.”

Macron proposed a G7-linked meeting in Paris involving Ukraine, Denmark, Syria, and Russia, along with a private dinner with Trump.

The publication of the message exposed a gap between Macron’s public opposition to Trump’s Greenland push and his private attempt to engage through traditional diplomacy.

Macron later said he had “no particular reaction” to the publication and insisted he was consistent in public and private. Nonetheless, the exposure was widely seen as diplomatically embarrassing.

NATO Leadership Entangled in Greenland Dispute

Trump also released a private message from NATO Secretary General Mark Rutte, in which Rutte praised Trump’s actions in Syria, Gaza, and Ukraine and wrote: “I am committed to finding a way forward on Greenland.”

The message fueled concern among alliance members that NATO’s leadership might be privately accommodating Trump’s demands despite public silence. Rutte has declined to comment publicly on Greenland, saying such matters cannot be addressed openly.

Former alliance officials and international law experts have warned that publishing private communications risks undermining confidential crisis diplomacy and encouraging rhetorical escalation rather than compromise.

Shift in Diplomatic Norms

The episode underscores a broader shift in how diplomacy is conducted under Trump’s leadership. Traditionally discreet exchanges are now being aired publicly, blurring the line between negotiation and political theatre.

Analysts say the practice erodes trust between leaders and makes candid dialogue more difficult, particularly during crises requiring rapid and confidential coordination. Some European officials privately fear that communications with Washington may now be calibrated as much for potential public exposure as for substance.

At the same time, the texts highlight the contrast between Trump’s confrontational public posture and the more cautious, conciliatory tone adopted by European leaders behind closed doors.

Implications for Transatlantic Relations

As Trump arrives in Davos, Europe faces a dilemma: how to resist U.S. pressure on Greenland without provoking further economic retaliation or strategic rupture.

While European leaders have rallied around Denmark’s sovereignty in public, the released messages suggest a quieter effort to manage Trump through engagement rather than confrontation.

The Greenland dispute has become emblematic of a wider strain in transatlantic relations, where security, trade, and diplomatic norms are increasingly entangled with personal politics and public spectacle.

"The United States needs Greenland for the purpose of National Security… IF WE DON’T, RUSSIA OR CHINA WILL, AND THAT IS NOT GOING TO HAPPEN!" – President Donald J. Trump 🇺🇸 pic.twitter.com/uDfWla0hNU

— The White House (@WhiteHouse) January 14, 2026