U.S. tariffs on steel and aluminum "will not go unanswered," European Union chief Ursula von der Leyen vowed on Tuesday, adding that they will trigger tough countermeasures from the 27-nation bloc. It means iconic U.S. industries like bourbon, jeans and motorcycles should beware.

"The EU will act to safeguard its economic interests," von der Leyen said in a statement in reaction to U.S. President Donald Trump's imposition of tariffs on steel and aluminum the previous day.