‘Act of great stupidity’: Trump launches another tirade against a NATO ally. This time it’s the UK – CNBC

Lead

On the eve of the World Economic Forum in Davos, U.S. President Donald Trump publicly criticized the United Kingdom over its 2025 agreement to transfer sovereignty of the Chagos Islands to Mauritius while leasing the Diego Garcia military base, calling the move “an act of great stupidity.” The exchange came after talks and public outreach between Mr. Trump and British Prime Minister Keir Starmer, and it risks further widening rifts within NATO. The dispute highlights tensions over strategic territory—Diego Garcia hosts a joint U.K.-U.S. military facility—and surfaces alongside Mr. Trump’s broader campaign to press European allies over Greenland. Both London and Washington now face questions about alliance cohesion heading into high-profile international meetings this week.

Key Takeaways

• The U.K. agreed in May 2025 to transfer sovereignty of the Chagos Islands to Mauritius while leasing Diego Garcia to the U.S. for £101 million ($135.7 million) per year.
• President Trump posted his criticism on Truth Social early Tuesday, labeling the transfer “an act of great stupidity” and warning China and Russia will see it as a sign of weakness.
• The exchange comes days before the World Economic Forum in Davos and follows other recent Trump confrontations with NATO partners, including threats of 200% tariffs on French wines and Champagne earlier this week.
• Prime Minister Keir Starmer publicly urged calm, saying decisions about Greenland rest with Denmark and the people of Greenland, and he reiterated the value of the U.S.-U.K. relationship.
• White House policy toward the Chagos deal had signaled support last year, making Trump’s rebuke a notable shift in tone from Washington.
• Trump has repeatedly pursued Greenland, a Danish territory, saying it should be acquired by the U.S.; Denmark and other European leaders maintain the island is not for sale.

Background

The Chagos archipelago, located in the central Indian Ocean, has been the subject of long-running sovereignty disputes. The islands include Diego Garcia, where a strategically positioned U.K.-U.S. military base has operated for decades. In May 2025, the British government reached a deal to return sovereignty to Mauritius while preserving the U.S. base under a lease arrangement valued at £101 million annually.

The arrangement followed international pressure and legal challenges concerning the forced displacement of Chagossians in the 1960s and 1970s. For Washington, Diego Garcia has been viewed as a critical logistics and power-projection hub across the Indian Ocean and into the Middle East. Historically, U.S. administrations have balanced strategic needs with diplomatic and legal sensitivities surrounding the islands.

Main Event

Early Tuesday on Truth Social, President Trump criticized London’s decision to transfer the Chagos sovereignty to Mauritius while maintaining the base lease, framing the move as strategically unsound. He argued that global rivals such as China and Russia would interpret the handover as weakness and said the choice was “for no reason whatsoever.” The post referred back to Trump’s public push for the United States to acquire Greenland, tying the two territorial disputes together in his rhetoric.

British Prime Minister Keir Starmer responded by urging a measured approach. In a Downing Street press conference, he emphasized the long-standing U.K.-U.S. “special relationship” and asserted that Greenland’s future is a matter for Denmark and Greenland’s people. Starmer also told Mr. Trump in a phone call on Sunday night that threats of tariffs were the wrong way to resolve disputes among allies.

The exchange follows a day in which Mr. Trump threatened punitive tariffs on France over a separate diplomatic spat, signaling a pattern of public pressure on NATO partners. U.K. officials have attempted to defuse tensions by calling for further dialogue and underscoring the operational assurances contained in the Diego Garcia lease.

Analysis & Implications

Strategically, Diego Garcia plays an outsized role in U.S. force posture across the Indian Ocean and beyond; any perception that the facility’s status is unstable could complicate operations and alliance planning. Even with a lease in place, a rhetorical attack from a U.S. president increases uncertainty among partners and may force NATO members to reassess contingency plans and basing assumptions.

Diplomatically, the incident exacerbates fractures between Washington and European capitals that have surfaced repeatedly during President Trump’s tenure. Public denunciations of close allies risk eroding trust, making cooperation on shared priorities—security, trade, and regional responses to China—harder to coordinate. Allies may react by tightening their own diplomatic and defense postures or by seeking assurances through multilateral fora.

Politically, Mr. Trump’s sharp language caters to a domestic audience that favors perceived strength, while also complicating relationships with leaders—like Starmer—who value measured multilateral engagement. The timing, immediately before Davos, raises the prospect that the episode will dominate conversations among global policymakers and investors, potentially distracting from economic agendas.

Comparison & Data

The table highlights key milestones tied to the dispute. The £101 million lease figure anchors financial commitments, while the sequence of meetings and public comments shows how diplomacy and domestic politics have intersected over a short period. Observers should watch for any formal renegotiation requests or legal challenges that might arise from affected parties.

Reactions & Quotes

British officials moved quickly to frame the incident within standard diplomatic channels, emphasizing dialogue. Starmer reiterated the principle that Greenland’s future rests with Denmark and Greenland itself and appealed for calm among allies before consequential decisions are taken.

“On Greenland, the right way to approach an issue of this seriousness is through calm discussion between allies.”

Keir Starmer, Prime Minister (Downing Street press conference)

The White House previously expressed support for the 2025 Chagos agreement, making Mr. Trump’s sharp public criticism notable. U.S. officials and analysts now face pressure to clarify policy ahead of Davos.

“Shockingly, our ‘brilliant’ NATO Ally, the United Kingdom, is currently planning to give away the Island of Diego Garcia… an act of GREAT STUPIDITY.”

Donald J. Trump, President of the United States (Truth Social)

Mauritian and international legal observers continue to watch implementation of the sovereignty transfer and the protections for displaced Chagossians; their public statements emphasize legal processes and human-rights concerns rather than rhetoric between capitals.

Unconfirmed

• Any deliberate change to the operational status of the Diego Garcia base beyond the signed lease has not been announced and remains unconfirmed.
• Claims that Mr. Trump will deploy military force to acquire Greenland are unverified and based on prior statements rather than any public, actionable plan.

Bottom Line

The dispute over the Chagos/Mauritius deal and Diego Garcia underlines strains in transatlantic relations at a moment when NATO unity is strategically important. While the lease preserves the U.S. military presence on Diego Garcia, public denunciations by a sitting U.S. president complicate trust between partners and invite scrutiny from geopolitical competitors.

Diplomats will likely try to contain the fallout through bilateral talks and multilateral consultations at Davos and beyond. Observers should track any formal policy shifts, legal challenges related to the Chagos settlements, and whether the rhetoric translates into tangible changes in defense posture or trade measures among allies.

Sources

• CNBC — news article reporting the exchange and timeline (media)
• The White House — official U.S. administration site for prior statements and policy context (official)
• UK Prime Minister’s Office / Downing Street — official statements and press briefings from the British government (official)