<h1>Presidential Tariff Threats Spark Market Panic, Tech Stocks Tumble as Global Indices Brace for Economic Uncertainty</h1> Markets plummeted after presidential tariff threats targeting the European Union and a major technology company. Stock futures declined sharply, with S&P 500 and Dow Jones futures dropping 1.5% and Nasdaq futures falling 1.7%. European markets immediately responded negatively, with significant losses across major indices. The technology company's shares dropped 3.8% following a potential 25% tariff threat. Oil prices and Treasury yields also experienced declines in response to the announced trade tensions.