Tensions around Ukraine will dominate markets Friday as diplomatic efforts are expected to generate plenty of headlines ahead of Sunday's referendum in Crimea.
Stocks tumbled Thursday in the worst day of selling in more than month. The Dow was down 230 to 16,109 and the fell 21 to 1,846, below the key 1,850 level.
Headline after headline on Ukraine added to Thursday's unease, including a warning from German Chancellor Angela Merkel of "catastrophe" if Russia does not drop its plans to annex Crimea.
