US STOCKS-S&P 500 ends at a record; Ukraine-Russia tensions ease

... ». * Putin says use of military force would be last resort. * RadioShack closing 1,100 stores after sales tumble 20 pct. * S&P 500 up 1.4 percent for the year. * Dow up 1.4 pct; S&P 500 up 1.5 pct; Nasdaq up 1.8 pct. By Angela Moon. NEW YORK, March 4 ... Read Full Story