UK King Charles III Visits US Amid Tensions Over Iran Conflict and NATO Relations

King Charles III of the United Kingdom arrived in the United States on April 27 for an official visit, marking the first visit by a British monarch since 2007. The visit comes amid heightened tensions between the US and UK over differing approaches to the ongoing conflict involving Iran. Former President Donald Trump and First Lady Melania Trump welcomed King Charles III and Queen Camilla at the White House in Washington, D.C.

Diplomatic Visit Amid Strained UK-US Relations

During his visit, King Charles III is scheduled to address both chambers of the US Congress, an honor granted only once before to a British monarch—Queen Elizabeth II, who spoke in 1991. Following his congressional address, the King and Queen will travel to New York to participate in a memorial event commemorating the victims of the September 11, 2001 terrorist attacks.

Security measures have been significantly tightened due to a shooting incident on April 25 at the Washington Hilton hotel. The hotel was hosting the annual White House Correspondents’ Association dinner, which President Trump attended.

"King Charles III arrived in the US with a delicate mission to restore traditionally close UK-US relations, recently shaken by diverging policies on the war involving Iran," analysts note.

The tension between Washington and London largely stems from disagreements over military strategies in the Middle East. UK Prime Minister Keir Starmer declined US requests to use British military bases for strikes against Iran and refused to deploy UK naval forces to the strategically crucial Strait of Hormuz, a key oil shipping lane.

In a notable interview published on April 1, Donald Trump criticized the UK’s navy as "too old" to effectively clear the Strait of Hormuz. He further denounced NATO allies as "cowards" for their stance on the Iran conflict, calling the alliance a "paper tiger" and revealing that he was seriously considering withdrawing the US from NATO.

Conversely, Prime Minister Starmer expressed frustration over the volatility of British energy bills, attributing fluctuations to global actions by leaders including Russia's Vladimir Putin and former President Trump. Starmer emphasized UK investments in domestic energy infrastructure to reduce dependency on international actors who manipulate gas prices.

Despite these diplomatic strains, Trump stated in March that the cooling UK-US relationship would not impact King Charles III’s visit. He described the monarch as "an excellent guy" and "a friend," underscoring that the King is separate from NATO matters.