Mixed earnings, Greek jitters fuel market caution

By Lionel Laurent LONDON (Reuters) - The euro rose and shares slipped in Europe on Tuesday as mixed corporate earnings and concerns over Greece kept investors cautious ahead of a busy week which will include the first policy meeting of the U.S. Federal Reserve this year. Russian markets were also jittery after a cut to the country's sovereign credit rating. Investors will be keen to hear the Fed's response to the recent policy easing by global central banks such as the European Central