BRUSSELS -- European Commission President Ursula von der Leyen warned on Saturday that Washington's decision to impose 30 percent tariffs on European Union (EU) exports risks severely disrupting transatlantic supply chains, and pledged that the EU would respond with countermeasures if necessary.

"Imposing 30 percent tariffs on EU exports would disrupt essential transatlantic supply chains, to the detriment of businesses, consumers, and patients on both sides of the Atlantic," von der Leyen said in a statement.

Her comments followed an earlier announcement by U.S. President Donald Trump, who said his administration would impose 30 percent tariffs on EU exports, arguing that bilateral trade had long been unbalanced and lacked reciprocity.

Von der Leyen responded that the EU remained committed to a negotiated solution, but emphasized that the bloc would act to defend its economic interests if negotiations failed.

"We remain ready to continue working towards an agreement by Aug 1," she said, "At the same time, we will take all necessary steps to safeguard EU interests, including the adoption of proportionate countermeasures if required."