U.S. President Donald Trump issued new tariff threats on Friday that targeted the European Union and makers of smartphones, saying the E.U. will face a 50% levy on June 1 because trade talks are “going nowhere.

President Trump’s threat to impose 50% tariffs on European Union goods may be a negotiating gambit. But it also shows why reaching trade deals with major exporters including Japan and South Korea will be far tougher than with the U.