European stocks fell sharply Monday after President Trump threatened sweeping tariffs on eight allied nations in a bid to force the sale of Greenland — rattling investors and reviving fears of a full-blown transatlantic trade war while US stock markets were closed for the Martin Luther King Jr. Day holiday. The Stoxx Europe 600 index plummeted 1.2% as investors dumped export-heavy names exposed to the US market. Germany’s DAX dropped 1.3% to its lowest level in nearly two weeks, while France’s