Elon Musk has never been shy about sharing his opinions to his 211 million followers on X. But for those who follow him—and those who get his posts pushed into their feeds on the app—the past few weeks have been more unusual than most. Musk, the South African–born, United States–based tech CEO, has posted a near-nonstop slew of missives targeting European leaders.

On Monday, Musk posted a poll asking whether “America should liberate the people of Britain from their tyrannical government.” This came hours after he turned against Nigel Farage, the leader of Britain’s right-wing Reform U.K. party and a former ally of Musk’s. Late last month, Musk also wrote an op-ed for a German newspaper in support of the far-right Alternative for Germany party (AfD); Musk’s piece caused the newspaper’s opinion editor to quit in protest.

For his American audience, the incessant commentary on European matters may be puzzling. For Europeans, it’s annoying—and European leaders are pushing back.

On Monday, U.K. prime minister Sir........

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