Europe Faces Renewed Strain as Trump Reopens Transatlantic Fault Lines

European leaders are once again grappling with a volatile relationship with President Donald Trump, as tensions over the war in Iran trigger a fresh round of diplomatic and economic friction across the Atlantic.

In recent days, Trump has sharply criticised several key European allies. He dismissed German Chancellor Friedrich Merz as “totally ineffective” after Merz questioned Washington’s handling of the Iran conflict. Shortly afterward, the Pentagon announced plans to withdraw 5,000 US troops from Germany, reducing the American military presence there from 36,400 personnel.

The White House also moved to raise tariffs on European Union cars and trucks, a decision expected to hit Germany’s export-driven economy particularly hard.

Britain has also found itself under pressure. Trump took personal aim at Prime Minister Keir Starmer, saying he was “not Winston Churchill,” while threatening new tariffs on British imports. The administration has also floated measures that would penalise NATO allies seen as insufficiently supportive of US military operations in Iran.

Among the proposals reportedly under discussion are the suspension of Spain’s NATO membership and a review of Washington’s recognition of British sovereignty over the Falkland Islands.

European diplomats say the latest developments have revived concerns that relations with Washington are once again entering a period of instability.

“It’s unnerving to say the least,” one European diplomat said. “We are braced for anything, anytime.”

The renewed strain comes after months of efforts by European leaders to steady ties with Trump during his second term. Merz, Starmer and Italian Prime Minister Giorgia Meloni had all sought to maintain close engagement through frequent meetings, trade discussions and policy adjustments.

Yet the outbreak of war with Iran in February has pushed Europe back into Trump’s line of fire. Even NATO Secretary General Mark Rutte, often seen as adept at managing relations with Trump, reportedly faced criticism during a recent White House meeting.

Some European officials now believe a more measured approach is best. One diplomat pointed to former German Chancellor Angela Merkel’s handling of Trump during his first term as a useful model: remain calm, avoid reacting immediately, and hold firm on core positions.

At the same time, European leaders appear increasingly willing to voice disagreement. Analysts say domestic political pressures, particularly rising energy prices linked to the conflict, are making it harder for governments to stay silent.

Despite the tensions, European governments remain committed to the transatlantic alliance. However, many now see the need for greater strategic independence.

Diplomats and defence officials across the continent are accelerating plans to strengthen Europe’s military capabilities, reflecting a growing consensus that the region can no longer depend entirely on longstanding security arrangements.

As one Western diplomat put it, Europe must be prepared to back its values not only with diplomacy, but with power.