As financial markets settled into an unusual state of tranquility, with stocks slowly grinding higher week after week and bond yields hovering in narrow ranges, many on Wall Street started to prepare for a sudden jolt.

On Tuesday, it came.

U.S. benchmark stock indexes sank more than 2%, the dollar slid against most major currencies and 30-year bond yields climbed toward 5% as U.S. President Donald Trump¡¯s latest push to take over Greenland rippled through markets. His threat to slap new tariffs on European allies ¡ª combined with a plunge in Japanese debt ¡ª boosted measures of price swings from historically low levels.