Stocks on world markets advanced on Thursday, reversing early declines as comments from U.S. Federal Reserve Chair Janet Yellen offset concerns over tension in Ukraine and Russia.
Yellen signaled the central bank was likely to stay the course in its current plan to scale back its stimulus measures and said the Fed would be on alert to make sure recent signs of weakness in the U.S. economy are due to cold weather and storms, not signals of a more fundamental slowdown.
