Stocks ended lower as cheer over the European Central Bank's unexpected rate cut faded, a day ahead of the government's monthly payrolls report.
Stocks were little changed, as Wall Street caught its breath after the Dow hit an all-time high and the S&P 500 closed above 2,000 for the first time.
Stocks see-sawed, climbing at first then falling after a report that Ukrainian artillery destroyed most of a Russian military convoy.
Stocks slipped in light volume trading on Tuesday for the first time in three sessions as developments in Ukraine and Russia rattled investors.
Stocks squeezed out gains on Monday in light-volume trading as investors looked for signs of easing in geopolitical tensions.