Mixed earnings, Greek jitters fuel global 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. Russia was also in the spotlight after a cut to its credit rating dealt a further blow to the rouble, though by Tuesday the currency had regained some ground against the dollar. Investors will be keen to hear the Fed's resp