President Donald Trump's tariff threats against European countries opposed to him to acquiring Greenland present America's longtime allies with a big problem of how to respond.

Iran's supreme leader Ayatollah Ali Khamenei says authorities "must break the back of the seditionists" after a crackdown on a protest wave against the country's clerical authorities.

"Tariffs would undermine transatlantic relations and risk a dangerous downward spiral. Europe will remain united, coordinated, and committed to upholding its sovereignty," European Commission Presiden...