U.S. stocks advanced Monday, after the Nasdaq Composite briefly detoured into negative terrain, as investors embraced data that had U.S. retail sales jumping the most since 2012 while tracking tensions in Ukraine.

"We're hopeful that today's upward price action is not confined, but we're also cognizant of continued unrest in that geography," Jim Russell, senior equity strategist for US Bank Wealth Management, said of Ukraine, where pro-Russian separatists reportedly disregarded an order to depart government building in eastern parts of the country as government troops did not follow up on a threatened offensive.