U.S. stocks turned higher in afternoon trading as the S&P 500 looked to cap its longest winning streak since February even as trade tensions ratchet higher and America slapped sanctions on Russia. Oil tumbled and Treasuries rose. Technology and financial shares lifted the American equity benchmark toward a fifth day of gains, offsetting concern sparked when Washington and Beijing set dates for new levies on billions in goods. Trading was 17 percent below average. Energy producers led losses after crude sank 4 percent. Investors scooped up a record $26 billion 10-year Treasury auction Wednesday, showing that ... (full story)