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This is the world in brief from The Economist.

Our top stories.

Donald Trump said he will impose a 50% tariff on EU imports from June 1st,

claiming that trade talks with the block are, quote, going nowhere.

He also threatened a 25% tariff on iPhones made outside America,

pressuring Apple to shift production from China and India.

The announcement's rattled markets, Apple shares fell 4%,

and Europe's Stock's 600 index dropped nearly 2%.

Mr. Trump approved a, quote, partnership between U.S. steel and Nippon Steel, a Japanese rival.

The president said that, under the deal, the American firm will remain in Pennsylvania, creating

jobs and adding $14 billion to America's economy. In January, President Joe Biden blocked a

proposed $14.9 billion takeover by Nippon, supposedly on the grounds that it was a threat to national security.

A judge in Boston temporarily blocked the Trump administration's effort to revoke Harvard University's

ability to enroll international students. She agreed that the move, which Harvard called

unconstitutional and politically motivated, would cause, quote, immediate and irreparable injury.

Christy Noam, America's Homeland Security Secretary, said the action follows Harvard's failure to provide records on alleged misconduct by foreign students. The university

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