US President Donald Trump has escalated trade tensions by announcing a potential 50% tariff on imports from the European Union, as trade talks remain stalled. Additionally, Trump has indicated that Apple could face a 25% tariff on iPhones unless they are manufactured in the US. The news has resulted in a significant drop in stock market futures, with the Dow tumbling by over 600 points. Wall Street and European stocks are also reacting negatively to these threats, with markets showing signs of instability. As negotiations continue, both the US and EU are expected to discuss tariff offers soon.