The turmoil in Ukraine is spooking world markets.
U.S. stocks tumbled by the largest margin in a month and the price of crude oil rose sharply on Monday as traders feared Russian exports could be affected by sanctions.
The Dow Jones industrial average dropped zero.9 percent, to 16,1-hundred-68.
The S&P 500 index fell zero.7 percent, the biggest drop since February 3rd.
European markets fared even worse.
Britain's FTSE index dropped 1-and-a-half percent, Germany's DAX 3.4 percent and Russia's benchmark stock index plunged TWELVE percent.
Gold -- a traditional safe haven in times of uncertainty -- rose 2.2 percent to 13-hundred-50 dollars an ounce, its biggest gain of the year.